PSLE
Yoko and Risa folded paper cranes over two days. On Wednesday, Yoko folded 71 paper cranes more than Risa. On Thursday, Yoko folded another 12 paper cranes and Risa folded another 8. At the end of the two days, Yoko made ⁷₉ of the total number of cranes. What was the number of paper cranes that Yoko folded?

	Yoko	Risa	Difference
Before	1 u + 71	1 u	71
Change	+ 12	+ 8
After	1 u + 83	1 u + 8	75
Comparing between Yoko and Risa in the end	7 p	2 p	5 p

Difference between the number of paper cranes that Yoko and Risa folded in the end is repeated.

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

Difference between the number of paper cranes that Yoko and Risa folded in the end
= (1 u + 83) - (1 u + 8)
= 1 u + 83 - 1 u - 8
= 83 - 8
= 75

5 p = 75

1 p = 75 ÷ 5 = 15

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

Answer(s): 105