Question

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.

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Answer to a math question 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.

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Maude
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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

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