Question

Kritika is on a 4 days trip with school mates. She had decided to keep her average expense for 4 days at Rs 80. However, at the end of third day she realized that her expenses on first three days were Rs 80, Rs 90, Rs 110 and respectively. How much should she spend on 4th day to ensure that she meets her targeted average expense?

Answer 1

Answer:

40......

am i right?.......