Question

a box has four eraser . how many eraser do 8 boxes have ?​

Answer 1

Answer:

You can set up a proportion:

First write down what you know: for every 3 pencils there are 2 erasers and there are 12 pencils in a box

What you want to know: How many erasers in the box

pencil/erasers = pencil/erasers

3/2 = 12/x (substitute what you know

3x = 2(12) (cross multiply)

3x = 24 (simplify)

x = 24/3 (divide both sides by 3)

x = 8 (simplify)

there are 8 erasers in the box

check 12/8 = 3/2 (if you divide numerator and denominator by gcf 4)

Answer 2

Answer:

1 box = 4 erasers

8 box = 4 × 8

= 32

32 erasers