PSLE
Tina and Hilda folded paper cranes over two days. On Monday, Tina folded 12 paper cranes more than Hilda. On Tuesday, Tina folded another 12 paper cranes and Hilda folded another 3. At the end of the two days, Tina made ⁵₇ of the total number of cranes. What was the number of paper cranes that Tina folded?

	Tina	Hilda	Difference
Before	1 u + 12	1 u	12
Change	+ 12	+ 3
After	1 u + 24	1 u + 3	21
Comparing between Tina and Hilda in the end	5 p	2 p	3 p

Difference between the number of paper cranes that Tina and Hilda folded in the end is repeated.

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

Difference between the number of paper cranes that Tina and Hilda folded in the end
= (1 u + 24) - (1 u + 3)
= 1 u + 24 - 1 u - 3
= 24 - 3
= 21

3 p = 21

1 p = 21 ÷ 3 = 7

Number of paper cranes that Tina folded
= 5 p
= 5 x 7
= 35

Answer(s): 35