Question

juan ate 15 grapes in 30 seconds at this rate how long should it take him to eat 85 grapes

Answer 1

85 / 15 = 5 2/3
30 x 5 = 150
2/3 x 30 = 20
The answer is 170 seconds, or 2 minutes and 50 seconds

Answer 2

15grapes/30seconds=85grapes/(x)seconds
15(times)x; 85×30
15x=2550
2550÷15=170seconds or 2 minutes & 50 seconds