Question

G. Find the ratio between a pen and pencil if ten pens cost $22.5 and a dozen pencils cost $18.​

Answer 1

Cost ratio of pens:pencils = 9 : 4

Explanation:

Pen : Pencil

10/10 : 12/12

22.5 / 10 : 18 / 12

2.25 : 1.5 cost per pen : pencil

HC of 0.25 and 0.5 is 8

8 x 2.25 = 18:

1.5 x 8 = 12

Then place them under their denominator x 10 x 12

pens = 18/10 = 1.8

pencils = 12/12 = 1

HC of 1.8 and 1 is 5

1.8 x 5 = 9

1 x 5 = 5

Answer = 9 : 4