Question

Karen made 40 cakes

she gives 1/5 to Andrew
she gives 10% to Chris
what fraction of the 40 cakes does she have left ?

Answer 1

1. You have that Karen made 40 cakes and she gives 1/5 to Andrew and 10% to Chris, then you have:

40 cakes=5/5=1
1/5 to Andrew⇒40x1/5=8
10% to Chris=40x0.10=4

1/5----8
x----4

x=4(1/5)/8
x=1/10

2. The fraction of the 40 cakes that she have left is:

1-1/5-1/10

Therefore, the answer is: 7/10