pls answer these questions and with solutions pls.....
1. A disc jockey must play 12 commercial spots during 1 hour of radio showw. Each commercial is either 30 seconds or 60 seconds long. If the total commercial time during that hour is 10 minutes, how many 30-sec commercials were played that hour? How many 60-sec commercials?
2. The ratio of girls to boys at aschool dance was 5:3. There would have been equal number of boys and girls if there had been 3 more boys and 3 fewer girls. How many girls and how many boys were at the dance??
pls. answer these questions with a table pls.... high priority
2006-08-19 12:48:55 · 9 answers · asked by jon jerico c 1 in Education & Reference ➔ Homework Help
The first one:
x-number of 60 second comercials
(12-x)-number of 30 second comercials
60x + 30(12-x)=600(6 minute=600 seconds)
60x+360-30x=600
30x = 240
X=8
He played 8 long ones.
12-8=4, he played 4 short comercials.
the second one:
G:B=5:3
5x - 3 = 3x + 3
2x = 6
X = 3
5×3=15
3×3=9
15 girls, 9 boys. Uh, what a party.
I hope this helps you.
2006-08-19 12:58:59 · answer #1 · answered by mathewthere 2 · 0⤊ 1⤋
1. u gotta make two equations for this one. Let the 30 sec commercials be x, and the 60 sec commercials be y.
ok then, we can see that the first equation wud be
x + y = 12
secondly,
30x + 60y = 600 (because 10 minutes = 600 seconds)
now, when u solve the above equations:
u get
x = 4 = no. of 30-sec commercials
y = 8 = no. of 60-sec commercials
2. Equation time again. Suppose girls are G, and boys B.
G/B = 5/3 (simple, right)
and
B+3 = G-3
by solving the above 2 equations, u get
B = 9 = no. of boys
G = 15 = no. of girls
dont i deserve a thank-u for this ?!
:)
2006-08-19 13:25:10 · answer #2 · answered by Salman 2 · 1⤊ 0⤋
#1 8 60 sec spots and 4 30 sec spots
#2 g 15 b 9
2006-08-19 12:59:49 · answer #3 · answered by stopuseifrashoccurs 1 · 1⤊ 0⤋
There are 600 seconds in ten mins. (60*10=600) So you divide 600by 30 thats gives ya 20 times, divide 600 by 60 that gives you 10. Sooo 10 60 sec commercials or 20 30 sec commercials
2006-08-19 12:59:02 · answer #4 · answered by gentlegiant255 2 · 0⤊ 1⤋
8 60 second commercials = 480 seconds, and
4 30 second commercials=120 seconds
12 commercials = 600 seconds or exactly 10 minutes.
There were 15 girls and 9 Boys.
2006-08-19 13:01:24 · answer #5 · answered by newsgirlinos2 5 · 0⤊ 0⤋
10=x(0.5) + y
12= x + y
12-x = y
Substituting
10 = x(0.5) + 12 - x
-2 = -0.5 x
4 = x, 8 = y
So there are 4 thirty 30 second commercials, and 8 sixty second commercials.
x/y=5/3 or 3x=5y
x-3=y+3, or x = y+6
substituting,
3y+18=5y, or 2y =18,
y=9, x=15 (from x=y+6)
so there are 15 girls and 9 boys.
2006-08-19 13:01:00 · answer #6 · answered by Wicked Mickey 4 · 0⤊ 1⤋
1. 60 second commercials = 10
30 second commercials = 20
2. I don't have time to figure that one out right now... Good Luck!
2006-08-19 12:55:11 · answer #7 · answered by ♪Meg♪ 2 · 0⤊ 1⤋
1. 8 at 60 4 at 30
2.15 girls 9 boys
2006-08-19 13:08:29 · answer #8 · answered by philliesmeyer 2 · 0⤊ 0⤋
come on really!! cheating!! now thats just wrong dude... i study my butt of for school and so should you.
2006-08-19 12:59:00 · answer #9 · answered by Anonymous · 0⤊ 1⤋