Question

Jerome takes a math course and a science course for summer school. For every 5 hours Jerome spends studying math, he studies science for 4 hours. If Jerome spent a total of 63 hours studying last week, then how long did he study math?

A. 35 hours

B. 70 hours

C. 12 hours

D. 34 hours

Answer 1

A; It took him 35 hours to study math.

Explanation:

Ratio of hours studying math to science is 5:4.

these added up get you 9

5/9; 4/9

Estimate: he can't study more than the total amount of hours for each week on math. this eliminates option B. Since he spends over half of his time studying math you can eliminate C (12 hours) because it is less than half of 63. 5/9 times 63 is 35.