PSLE
Ivory and Zoe folded paper cranes over two days. On Wednesday, Ivory folded 51 paper cranes more than Zoe. On Thursday, Ivory folded another 12 paper cranes and Zoe folded another 33. At the end of the two days, Ivory made ⁵₈ of the total number of cranes. What was the number of paper cranes that Ivory folded?

	Ivory	Zoe	Difference
Before	1 u + 51	1 u	51
Change	+ 12	+ 33
After	1 u + 63	1 u + 33	30
Comparing between Ivory and Zoe in the end	5 p	3 p	2 p

Difference between the number of paper cranes that Ivory and Zoe folded in the end is repeated.

Difference between the number of paper cranes that Ivory and Zoe folded in the end
= 5 p - 3 p
= 2 p

Difference between the number of paper cranes that Ivory and Zoe folded in the end
= (1 u + 63) - (1 u + 33)
= 1 u + 63 - 1 u - 33
= 63 - 33
= 30

2 p = 30

1 p = 30 ÷ 2 = 15

Number of paper cranes that Ivory folded
= 5 p
= 5 x 15
= 75

Answer(s): 75