2016-01-16T18:46:09+08:00

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The ratio of two numbers is 2:5. If the larger number is 25, what is the smaller number?
2:5 = n:25
2 (25) = 50
50 ÷ 5 = 10
2:5 = 10:25
To check, multiply the means and the extremes. It must be equal.
5(10) = 2 (25)
50  = 50

Three numbers have a ratio of 1:2:3. If their sum is 30, find the value of the largest number.
1 : 2 : 3 = 30
1 + 2 + 3 = 6
30 ÷ 6 = 5

5 (1) = 5
5 (2) = 10
5 (3) = 15

1:2:3 = 5:10:15

Mrs. Sanchez had 2 daughters. She have 30 cookies in all. The ratio of the number of cookies given to her elder daughter to the younger one is 2:3. How many does each of them have?
2 + 3 = 5
30 ÷ 5 = 6
6 (2) = 12
6 (3) = 18

Therefore, the older have 18 cookies while the younger have 12 cookies.

Those are just three examples of problems regarding proportion. I hope it help. ☺