Question

Arik bought 20 calculators at the electronics store. 40% of the calculators were scientific calculators and one half of the calculators were graphing calculators . How many neither scientific calculators nor graphing calculators

Answer 1

Ok lets grab our calculators!

Lets say Arik has 20 calculators at the store.

Lets multiply 20 x 40%

We should get 8

There is 8 scientific calculators

100 percent minus 40 percent is 60 percent

Lets multiply 20 x 60%

There is 12 graphing calculators

8 scientific calculators

12 graphing calculators

If you want to do this on paper or in your head

100 ÷ 20 = 5

each calculator is 5 percent