9 A shop sells packs of black pens, packs of red pens and packs of green pens.
There are
2 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,
number of packs
of black pens sold
number of packs
of red pens sold
number of packs
of green pens sold
= 7:3:4
A total of 212 pens were sold.
Work out the number of green pens sold.