PSLE
Mary and Tina folded paper cranes over two days. On Wednesday, Mary folded 60 paper cranes more than Tina. On Thursday, Mary folded another 25 paper cranes and Tina folded another 29. At the end of the two days, Mary made ⁷₁₀ of the total number of cranes. What was the number of paper cranes that Tina folded?

	Mary	Tina	Difference
Before	1 u + 60	1 u	60
Change	+ 25	+ 29
After	1 u + 85	1 u + 29	56
Comparing between Mary and Tina in the end	7 p	3 p	4 p

Difference between the number of paper cranes that Mary and Tina folded in the end is repeated.

Difference between the number of paper cranes that Mary and Tina folded in the end
= 7 p - 3 p
= 4 p

Difference between the number of paper cranes that Mary and Tina folded in the end
= (1 u + 85) - (1 u + 29)
= 1 u + 85 - 1 u - 29
= 85 - 29
= 56

4 p = 56

1 p = 56 ÷ 4 = 14

Number of paper cranes that Tina folded
= 3 p
= 3 x 14
= 42

Answer(s): 42