PSLE
Usha and Cindy folded paper cranes over two days. On Friday, Usha folded 58 paper cranes more than Cindy. On Saturday, Usha folded another 17 paper cranes and Cindy folded another 5. At the end of the two days, Usha made ⁷₉ of the total number of cranes. What was the number of paper cranes that Usha folded?

	Usha	Cindy	Difference
Before	1 u + 58	1 u	58
Change	+ 17	+ 5
After	1 u + 75	1 u + 5	70
Comparing between Usha and Cindy in the end	7 p	2 p	5 p

Difference between the number of paper cranes that Usha and Cindy folded in the end is repeated.

Difference between the number of paper cranes that Usha and Cindy folded in the end
= 7 p - 2 p
= 5 p

Difference between the number of paper cranes that Usha and Cindy folded in the end
= (1 u + 75) - (1 u + 5)
= 1 u + 75 - 1 u - 5
= 75 - 5
= 70

5 p = 70

1 p = 70 ÷ 5 = 14

Number of paper cranes that Usha folded
= 7 p
= 7 x 14
= 98

Answer(s): 98