tricks to solve problems on ratio and proportion?

Answer 1

Proportion/ratio

hard to write here where you can't show it as well (pretend there are bars to make each side fractions)

1 = 5
x 15

Multiply the diagonal that does not have a variable (letter) in it
1 x 15 = 15.
Then divide that number by the 3rd number (5 in this case)
15/5 = 3
The x is 3, so

second example
x = 44
15 3

Multiply the diagonal withouot the variable (letter)
15 X 44 = 660
Divide that by the third number (3 in this case)
660/3 = 220. The x is 220

Is that what you are looking for?

Answer 2

Which level r u asking?

anyway understand this
Q If 6 men can complete a piece of work in 24 days then how long would 4 men take to do the same work?

A write the quantity tobe found on the right side

Men Days
6 24
4 ? (Ask more or less)

Here obviusly more So 6/4x24= 36 days

Remember the no. above Q mark is always multiplied

Answer 3

Understand Ratio and Proportion with the help of a numerical. click on the Link to Watch the VIDEO explanation:
http://bit.ly/1uVx8os

Numerical
Now let's see a Problem on Ratio and Proportion.
A piece of string 175 cm in length was cut into two pieces, the ratio of their length was 5:2. Find the length of each piece.
Solution:
The ratio of the lengths of two pieces of the strings is 5:2. It means that the lengths of the two pieces are some common multiple of 5 and 2. Let this common multiple be x.
Then the lengths of two pieces are 5x cm and 2x cm respectively. As per the condition given in the problem, 5x + 2x = 175.
Therefore, 7x = 175
x = 25
Therefore, the length of the larger piece of string = 5x i.e., equal to 5 into 25 i.e., equal to 125 cm and the length of the smaller piece of the string is equal to 2x is equal to 2 into 25 that equals 50 cm.

Answer 4

1) multilply by x: x* 2/7 = 5 2 multiply by 7: x * 2 * 7/7 = 5*7 3) divide by 2 : x = 35 / 2 = 17.5 the notation a:b :: c:d is the SAME as a/b = c/d the ratio is greek geometry, the a/b is fractions algebra division, fractions, ratio, proportion, percent, and decimals are ALL THE SAME , just differnt ways to write the problem

Answer 5

Cross Multiply!!!

3/4 = x/12
36 = 4x
9 = x

Answer 6

Set it up as a fraction: for example, 3/4 = 2/x and solve for x. I'm an RN and that's how we set it up to do drug calculations.

Answer 7

for proportion the product of the means is equal to the product of the extremes
for eg
2:3::4:x
2*x=3*4
or u convert it into fractions which equal each other
for eg
2/3=4/x

Answer 8

1-simplify
2-do cross multiplication
3-write same things one under the other
4- are they increasing or decreasing
5-learn the rules a/b+1, a/b-1, ac=bd,...
6-get help from me for your difficult questions.

Answer 9

use just one formula: componendo n dividendo:
if a c
----- = -----
b d , then


a + b c + d
--------- = ----------
a - b c - d