PSLE
Ivory and Marion folded paper cranes over two days. On Tuesday, Ivory folded 11 paper cranes more than Marion. On Wednesday, Ivory folded another 12 paper cranes and Marion folded another 2. At the end of the two days, Ivory made ⁵₇ of the total number of cranes. What was the number of paper cranes that Marion folded?

	Ivory	Marion	Difference
Before	1 u + 11	1 u	11
Change	+ 12	+ 2
After	1 u + 23	1 u + 2	21
Comparing between Ivory and Marion in the end	5 p	2 p	3 p

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

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

Difference between the number of paper cranes that Ivory and Marion folded in the end
= (1 u + 23) - (1 u + 2)
= 1 u + 23 - 1 u - 2
= 23 - 2
= 21

3 p = 21

1 p = 21 ÷ 3 = 7

Number of paper cranes that Marion folded
= 2 p
= 2 x 7
= 14

Answer(s): 14