PSLE
Jane and Kathy folded paper cranes over two days. On Monday, Jane folded 50 paper cranes more than Kathy. On Tuesday, Jane folded another 17 paper cranes and Kathy folded another 2. At the end of the two days, Jane made ⁷₉ of the total number of cranes. What was the number of paper cranes that Kathy folded?

	Jane	Kathy	Difference
Before	1 u + 50	1 u	50
Change	+ 17	+ 2
After	1 u + 67	1 u + 2	65
Comparing between Jane and Kathy in the end	7 p	2 p	5 p

Difference between the number of paper cranes that Jane and Kathy folded in the end is repeated.

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

Difference between the number of paper cranes that Jane and Kathy folded in the end
= (1 u + 67) - (1 u + 2)
= 1 u + 67 - 1 u - 2
= 67 - 2
= 65

5 p = 65

1 p = 65 ÷ 5 = 13

Number of paper cranes that Kathy folded
= 2 p
= 2 x 13
= 26

Answer(s): 26