Question

A shopkeeper buys a number of books for rs 80.if he had bought 4 mote books for same amount

Answer 1

please type full question

Answer 2

Answer

A shopkeeper buys a number of packets of biscuits for ` 80.x If he had bought 4 more packets

for the same amount, each packet would have cost ` 1 less. How many packets did he buy?

Step-by-step explanation:

Number of packets x

Therefore total number of packets bought = 80/x

If he buys 4 more = x+40

total number of packets he can buy =80/x+4

But if he buys 4 more than he can buys 1 less packet

80/x -80/x+4 =1

80(x+4) -80x=x(x+4)

80x +320 -80x =X square +4x

80/x - 80/(x+4) = 1

80x – 80(x+4) = x(x+4)

80x -80x +320 = x2 +4x

X2 + 4x -320 =0

(x+20) (x-16)

X=-20     x=16

X=-20 not possible

So correct answer 16 packets