Q86 of 90 Page 133

A shopkeeper buys some packets of biscuits for rupees 80. Had he bought four more packets for the same amount each packet would have cost rupees 1 less. How many packets did he buy?

Let the cost of each packet be x


And the number of packet y


So, 1st statement



He bought more 4 packet = y + 4


Cost of each packet = x – 1


So, 2nd statement,



By putting the value of x from equation (1)




Multiplying by y from both the side





y(y + 20)–16(y + 20) = 0


(y + 20)(y–16) = 0


y = 16,–20


We never consider negative value at this type of problem


Y = 16 (number of packet )


X = 5 (amount per packet)


More from this chapter

All 90 →
84

Nidhi purchased two sarees of Rs. 2150 each. She sold one saree at a loss of 8% and other at a gain. If she had a gain of Rs. 1230 in the whole transaction. Find the selling prize of the second saree?

 85

A LED TV is available for Rs. 26880 inclusive of VAT. If the original cost of the TV is Rs. 24000 find the rate of VAT?

 87

A dinner set was bought for Rs. 2464 after getting a discount of 12% on its MP. Find the MP of dinner set?

 88

Out of a class of 45 students, five were absent 30% of the remaining had failed to do homework. Find the number of students who did the homework.