Question

The ratio of blue pens to black pens in a box is 3:5
(a) What fraction of the pens are black?
(b) What fraction of the pens are blue?

Answer 1

Answer:

(a) 5/8

(b) 3/8

Step-by-step explanation:

(a) The fraction of the pens are black

= 5/8

(b) The fraction of the pens are blue

= 3/8

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Answer 2

Answer:

Black pens - 5x and blue pens = 8x.

5x:(8x-20) = 5:6, or

30x = 40x-100

10x = 100, or

x = 10

So there were 50 black pens and 80 blue pens to start with.