Question

a box contains 192 pens, they are red green or blue. a quarter of the pens are red. the ratio of green pens to blue pens = 1:8. how many blue pens are there?

Answer 1

Number of RED pens...

192 * 0.25 = 48

Number of BLUE and GREEN COMBINED...

192 - 48 = 144

Number of BLUE pens...

144 / (1+8) = 9

9 * 1 = 9

ANSWER: 9 Blue pens

Answer 2

There are 18 blue pens there

expression=192x0.25=48

192-48=144

144 devided by 8 is 18

the answer is 18