Answer:
30%
Explanation:
To find the percentage spent on English, divide the amount of time spent on English by the total time, and express the fraction as a percent.
Yesterday's time: Math, 35 minutes; English, 15 minutes
English/Total = (15)/(15 +35) = 15/50 = 3/10
As a percentage, that is ...
3/10 × 100% = 30%
Yesterday, you spent 30% of your homework time on English.