Question

A businessman know that the price of commodity will increased by Rs. 5 per packet.He buy some packet of the commodity for Rs. 4500 .If he buy 10 more new packet then he will get 10 packet less. Find the actual number of packet brought by him

Answer 1

Answer:

Let the number of packets purchased by the businessman be x.

x

4500

+5

4500

=x−10

⇒

4500+x

4500x

=x−10

⇒4500x=4500x+5x

2

−45000−50x

⇒x

2

−10x−9000=0

Using

2a

−b±

b

2

−4ac

to find the roots of the quadratic equation

⇒x=

2×1

10±

(−10)

2

−4×1×(−9000)

⇒x=

2

10±

36100

⇒x=

2

10±190

x=100, x=−90

x cannot be negative.

Number of

Answer 2

Answer:

for example this 4000per day