SOLUTION: 5. In a zoo, the ratio of adults to children is 7 to 4. If there are 187 people in the zoo, how many children are there?

Algebra ->  Customizable Word Problem Solvers  -> Numbers -> SOLUTION: 5. In a zoo, the ratio of adults to children is 7 to 4. If there are 187 people in the zoo, how many children are there?       Log On

Ad: Over 600 Algebra Word Problems at edhelper.com


    

Question 604100: 5. In a zoo, the ratio of adults to children is 7 to 4. If there are 187 people in the zoo, how many children are there?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let +a+ = number of adults in the zoo
+187+-+a+ = number of children in the zoo
----------
+7%2F4+=+a%2F%28+187-a+%29+
Multiply both sides by +4%2A%28+187+-+a+%29+
+7%2A%28+187+-+a+%29+=+4a+
+1309+-+7a+=+4a+
+11a+=+1309+
+a+=+119+
+187+-+a+=+187+-+119+
+187+-+a+=+68+
There are 68 children in the zoo
check answer:
+7%2F4+=+119%2F68+
+7%2A68+=+119%2A4+
+476+=+476+
OK