PSLE
Sarah and Min folded paper cranes over two days. On Friday, Sarah folded 42 paper cranes more than Min. On Saturday, Sarah folded another 37 paper cranes and Min folded another 19. At the end of the two days, Sarah made ⁷₁₀ of the total number of cranes. What was the number of paper cranes that Sarah folded?

	Sarah	Min	Difference
Before	1 u + 42	1 u	42
Change	+ 37	+ 19
After	1 u + 79	1 u + 19	60
Comparing between Sarah and Min in the end	7 p	3 p	4 p

Difference between the number of paper cranes that Sarah and Min folded in the end is repeated.

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

Difference between the number of paper cranes that Sarah and Min folded in the end
= (1 u + 79) - (1 u + 19)
= 1 u + 79 - 1 u - 19
= 79 - 19
= 60

4 p = 60

1 p = 60 ÷ 4 = 15

Number of paper cranes that Sarah folded
= 7 p
= 7 x 15
= 105

Answer(s): 105