Parviz F. answered • 01/14/14

Tutor

4.8
(4)
Mathematics professor at Community Colleges

This is a problem of proportion:

For every 7 dollar contribution of Cate , her parents contribute 3 dollars

Now for 203 dollar contribution how much her parents add.

First you should find out how many 7 dollars Cate has contributed that has added up to 203

203÷ 7 = 29

so the parents contribution would be $29 * 3 = $87

I am sure in 3rd and 4th grade, without algebra you have solved problems like this.

Now by algebra we choose a variable X , for the contribution of parents, and write the proportion relation.

7 = 203

3 X

This reads : the ratio of contribution of Cate to her parents' is 7 to 3.

and solve for X.

7x = 203 * 3 = 609

X = 609/7 = 87