27 A shop sells packs of black pens, packs of red pens and packs of green pens.
There are
4 pens in each pack of black pens
5 pens in each pack of red pens
6 pens in each pack of green pens
On Monday,
= 7:3:4
number of packs
of black pens sold
:
number of packs
of red pens sold
number of packs
of green pens sold
A total of 268 pens were sold.
Work out the number of red pens sold.