Question

A store sells different colored pens. The circle graph below represents all pens for sale at the store. There are 200 black pens for sale at the store. How many blue pens are for sale at the store. In circle graph (black pens:40%, blue pens:35%) ?

Answer 1

175

Explanation:

Set up a ratio

let x = blue pens
35% = the percentage of blue pens
200 = black pens
40% = the percentage of black pens

`x/200 = 35/40`

multiplying both sides by 200 gives

`x/200 xx 200 = 35/40 xx 200`

`x = 175`

Answer 2

200 pens = 40% `=>10%=50` pens

500 pens in total

`10%=50`
`20%=100`
`(5%=25)/(35%=175)`