Question

4 2 1. Rani ate part of a cake while her brother ate of the remaining. Part of the cake left is 5​

Answer 1

u have written half question

the question is :

Rani ate 2/7 part of a cake while her brother Ravi ate 4/5 of the remaining. Part of the cake left is 1/7.

Solution: Now, let us assume total part of cake be 1.

Then, from the questions, given that Rani ate 2/7 part of a cake = 1 – (2/7) = (7 – 2)/7 = 5/7

So, Ravi ate 4/5 of the remaining cake = (4/5) × (5/7) = 4/7

Therefore, the part of the cake left = (5/7) – (4/7) = 1/7