Question

Rohan went to the stationary shop to buy pencil and erasers.The cost of a pencil is twice the cost of an eraser.He bought 8 pencils and 4 erasers and Rs.100.How much did he pay for each pencil and each eraser?

Answer 1

Let cost of eraser be X
pencil be y
y=2x
total paid 100
8y+4x=100
8(2x)+4x=100
16x+4x=100
20x=100
x=5
cost of eraser is rs5
cost of pencil is 2*5=10
cost of eight pencils is 8*10=80rs

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