Question

Rajat bought three packets of biscuits for rupees 24 how much money is required to buy 7 such packets​

Answer 1

Let the no of packets be x 

let the cost of each packet be y

so xy = 80 ⇒ y = 80/x

so if he would have bought 4 more packets for the same amount, each packet would have cost rupees 1 less  (x+4)(y-1)=80

⇒ (x+4)(80/x-1)=80

⇒ x² + 4x - 320 = 0

⇒ x² + 20x - 16x - 320 = 0

⇒ (x - 16)(x + 20) = 0

so x = 16 or - 20 

so number of packets can't be negative

so 16 packets he bought ANSWER

Answer 2

Answer:

Step-by-step explanation:

price of 1 packet of biscuit be x:

 

   x  ×  3 ⇒ 24

x ⇒ 24÷3

x⇒8

value of 1 packet is 8 rupees

price of 7 packets:

⇒  8  ×  7

answer⇒  56

     hope this helps you