a bookshop has a total of 760 pens and rulers. 70% of the pens and 60% ofthe rulers were sold. the owner of the bookshop bought 41 rulers. on the end, the number of pens left was three times the number of rulers left.

let he has p pens and r rulers the total is 760 p+r=760 ----eq1 70% pens sold means 0.7p sold therefore 0.3p will be left with him 60% of rulers sold means 0.6r sold therefore 0.4r will be left with him now he bought 41 rulers therefore the total rulers he has is 41+0.4r the number of pens is three times the number of rulers left 3(41+0.4r)=0.3p ---eq2 by eq1 3\left(41+0.4r\right)=0.3\left(760-r\right) 1.2r+123=228-0.3r r=\frac{105}{1.5}=70 p=760-r p=760-70 p=690