Question

A shop sells packs of black pens, packs of red pens and packs of green pens.

There are
3
pens in each pack of black pens
5 pens in each pack of red pens
pens in each pack of green pens
On Monday,
number of packs number of packs
of black pens sold of red pens sold
=7:3:4
number of packs
of green pens sold
A total of 212 pens were sold.
Work out the number of green pens sold.

Answer 1

85 pens

Explanation:

The computation of the number of green pens sold is shown below;

As the number of black pens, red pens, and green pans is 3:5:6

And, the ratio of sold of black pens, red pens, and green pans is 7:3:4

So, the ratio of pens in a number of pens is

= 3 × 7 : 5 × 3 : 4 × 6

= 21: 15 : 24

= 7: 5 : 8

And, the total of 212 pens are sold

So, the number of green pens sold is

= 8 × 212 ÷ (7 + 5 + 8)

= 85 pens