Question

Jim buys two boxes of apples. 90% of the total apples are ripe.

Answer 1

15*2=30
30*90/100=27
30-27=3

Answer 2

Jim buys 2*15=30 apples
To get the answer we have to find 90% of 30
90% = 0.9
0.9*15=27
Now we can subtract 30-27=3 - its the answer