Question

Rohit bought a pencil for Rs. 2/5 and an eraser for Rs. 7/10 . He gave Rs 10 to the shopkeeper. How much money is left with him.

Answer 1

Answer:

Amount of pencil = Rs. 2/5

amount of eraser = Rs. 7/10

Amount he gave to the shopkeeper = Rs.10

money left with him = (2/5 + 7/10) - 10

now first we add 2/5 and 7/10

take lcm of 5 and 10

lcm is 10

= 2×2/5×2 + 7×1/10×1

= 4/10 + 7/10

= 11/10

Now subtract 11/10 from 10

take denominator of 10 as 1

10/1 - 11/10

lcm of 1 and 10 = 10

10×10/1×10 - 11 ×1/10×1

100/10 - 11/10

89/10 = 8.9

money left with rohit = Rs 8.9