PSLE
Linda and Fanny folded paper cranes over two days. On Saturday, Linda folded 33 paper cranes more than Fanny. On Sunday, Linda folded another 19 paper cranes and Fanny folded another 7. At the end of the two days, Linda made ⁷₉ of the total number of cranes. What was the number of paper cranes that Fanny folded?

	Linda	Fanny	Difference
Before	1 u + 33	1 u	33
Change	+ 19	+ 7
After	1 u + 52	1 u + 7	45
Comparing between Linda and Fanny in the end	7 p	2 p	5 p

Difference between the number of paper cranes that Linda and Fanny folded in the end is repeated.

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

Difference between the number of paper cranes that Linda and Fanny folded in the end
= (1 u + 52) - (1 u + 7)
= 1 u + 52 - 1 u - 7
= 52 - 7
= 45

5 p = 45

1 p = 45 ÷ 5 = 9

Number of paper cranes that Fanny folded
= 2 p
= 2 x 9
= 18

Answer(s): 18