Science & Mathematics - 17 February 2007

1) An old man had some coins to give to his friends. If he gave each friend 6 coins,he would have 4 coins too many. But if he gave each friend 7 coins,he would need another 5 coins. How many friends did he have?

2) 45 teachers and pupils were at an exhibition. There were 35 more teachers than pupils. If there were 6 fewer male teachers than female teachers, how many male teachers were there?

2007-02-17 23:00:16 · 13 answers · asked by keeshbubbles 1 in Mathematics

2007-02-17 23:00:06 · 3 answers · asked by ramu r 1 in Physics

2007-02-17 22:58:14 · 10 answers · asked by D.L. Miller 3 in Zoology

how does male pollinate them?
for example china boy holly and china girl holly?
how many china boys are needed to pollinate say 5 china girl hollies?

does this always take place in spring time?
is that why pollen is soo bad then?
and this pollination allows what to happen?

(sorry, i am new to this stuff)

2007-02-17 22:49:40 · 3 answers · asked by Anonymous in Botany

A boy sells 30 oranges. 2 for 1 rupee earns 15 rupees. again he sells 30 oranges 3 for 1 rupee and earns 10 rupees. total income is 25 rupees.
next day he sells 60 oranges (mixed from both kinds) and sells combined 5 for 2 rupees but earns 24 rupees. why loss of one rupee.

30 2 - 1 15 rupees
30 3 - 1 10 rupees

60 5 - 2 24 rupees
why is loss of Re. 1 in case of combined selling ?

2007-02-17 22:45:29 · 6 answers · asked by Manz 5 in Mathematics

please include in your answer if you are a doctor ,a patient, or just a common person...
i admire it a lot!

2007-02-17 22:43:54 · 3 answers · asked by Anonymous in Medicine

I want to know about the patterns of macroevolution and its mechanism? and especially its detailed patterns.
if anyone can give me the site adress, i will be thankful.

2007-02-17 22:38:47 · 6 answers · asked by saim 1 in Biology

2007-02-17 22:35:19 · 7 answers · asked by arlene c 1 in Astronomy & Space

XR and Xr are the symbols,
the F2 crosses are red males= XR Y
white females = Xr Y
Females homozygote = XR XR
Females hetrozygote = XR Xr

if homozygote cross, XR XR + Xr Y
if hetrozygote cross, XR Xr + Xr Y

PLEASE EXPLAIN DIAGRAMES IF POSSBLE, OR SHOW, WOULD MUCH APPRICIATE THE ASSISTANCE

2007-02-17 22:30:47 · 2 answers · asked by Anonymous in Zoology

2007-02-17 22:30:11 · 4 answers · asked by arlene c 1 in Astronomy & Space

0.5x10^-2 M. Selectively precipitate the Ag + and Pb 2+ ions by adding an aqueous solution of Chloride ions.Given the Ksp for Silver Chloride as 1.8x10^-10 and that for Pb 2 Chloride as 1.6x10^-5, determine the concentration of Chloride ions required to bring about precipitation of each ion.also determine which ion (which salt) will precititate first


plz,plz help with this home work question, i don't even know where to begin. Thanks

2007-02-17 22:29:57 · 1 answers · asked by tq 3 in Chemistry

Three particles A, B and C have masses 0.2kg, mkg and 0.3kg respectively. the particles are free to move on a smooth horizonatal table. initially the particles lie in a straight line, with B and C at rest, and A is moving directly towords B with speed 'u'ms-1. After A's collision with B, the speed of A is '1/2u'ms-1 in the same direction as before. When B collides with C, the particles B and C coalesce and begin to move with speed '1/4u'ms-1.

a) Find the value of m
b) Find in terms of u, the speed of B before it collides with C

2007-02-17 22:28:35 · 3 answers · asked by Leonidus 2 in Weather

If one root of the quadratic equation x^2-kx-2=0 is 2, find the value of k and the other root. here is what i have so far. am i on the right track.

sorry about the other question the known root is 2

2007-02-17 22:26:10 · 5 answers · asked by Anonymous in Mathematics

I know that the regions near Bellingen Ker/Tully in QLD, have Australia's highest rainfall. I want to know, which places/regions come second and third, statistically and how much rainfalls there annually.

2007-02-17 22:21:11 · 2 answers · asked by Kristina G 1 in Weather

earth

2007-02-17 22:19:56 · 5 answers · asked by arlene c 1 in Astronomy & Space

Two small blocks A and B have masses 0.36kg and 0.32kg respectively. Block B is stationary on an ice rink 17m from a boundry wall. Block A is moving at 8ms-1 at right angles to the boundry wall when it strikes B. Block A continues in the same direction, and its speed immediately after the collision is 2.4ms-1.

a) Find the speed with which B starts to move?

b) Given that B moves with constant retardation, and reaches the boundry wall with speed 5.6ms-1, find the coefficient of friction between B and the surface of the ice?

Please show all your working out. Thank you

2007-02-17 22:14:54 · 3 answers · asked by Leonidus 2 in Physics

2007-02-17 22:10:23 · 8 answers · asked by SANGEETA MALWANKAR 1 in Mathematics

I think they have probably tried.

2007-02-17 22:05:32 · 4 answers · asked by JackDaniels024 3 in Astronomy & Space

I wanted to control the project cost and at the same time the current schedule,actual start dates if it's meet with the given time frame.I am more focus on planning and scheduling for engineering and construction.

2007-02-17 22:04:46 · 2 answers · asked by bb 1 in Engineering

Also, why would the C6H12 have a ring structure?

Any help appreciated.
Many Thanks.

2007-02-17 22:00:26 · 4 answers · asked by Anonymous in Chemistry

I tried Google Earth which is a good program but the images are 1 to 3 years old. I need a program that will show me the "Today" picture of a particular location.

If anyone can direct me to such a program I would greatly appreciate the help.

2007-02-17 21:57:55 · 2 answers · asked by Anonymous in Astronomy & Space

How do you find the percentage difference between a set of values?

2007-02-17 21:56:40 · 2 answers · asked by mbchelsea 1 in Mathematics

2007-02-17 21:55:33 · 11 answers · asked by Fipa 2 in Weather

How do I convert Octal to Decimal, and Decimal to Octal???
Please explain.

2007-02-17 21:54:20 · 7 answers · asked by Peter H 1 in Mathematics

2007-02-17 21:52:42 · 4 answers · asked by vivacious 1 in Engineering

2007-02-17 21:49:56 · 7 answers · asked by raj s 1 in Astronomy & Space

2007-02-17 21:48:56 · 5 answers · asked by Fipa 2 in Weather

we have considered that earths magnetic field flows from north to south, so if we go on the point where the flow begins & hold a magnetic compass(needle) , horizontally, what will hapen?

2007-02-17 21:42:36 · 1 answers · asked by shaileshsmartguy 1 in Earth Sciences & Geology

2007-02-17 21:41:26 · 13 answers · asked by Anonymous in Zoology

I took a photo at night in turkey and beside it is like a ufo in orange
no stupid wise cracks please. it wasnt noticeable when I had it on camera but when it was blown up it realy stood out.

2007-02-17 21:40:04 · 9 answers · asked by gwen w 2 in Astronomy & Space