Question

7. You record the heights of two plants each month for 3 months. In what month will Plant A be as tall as Plant B?

Answer 1

16

Explanation:

starting from month 2, how many more months will A be as tall as B?

A grows at 1.75 in per month

B grows at 1.5in per month

so 7.5+1.75x = 11+1.5x

solve for x

x=14

so from month 2, need to go for another 14 mos.

so at month 16, they'll be same height