PSLE
Gabby and Vanessa folded paper cranes over two days. On Saturday, Gabby folded 36 paper cranes more than Vanessa. On Sunday, Gabby folded another 15 paper cranes and Vanessa folded another 1. At the end of the two days, Gabby made ⁷₉ of the total number of cranes. What was the number of paper cranes that Vanessa folded?

	Gabby	Vanessa	Difference
Before	1 u + 36	1 u	36
Change	+ 15	+ 1
After	1 u + 51	1 u + 1	50
Comparing between Gabby and Vanessa in the end	7 p	2 p	5 p

Difference between the number of paper cranes that Gabby and Vanessa folded in the end is repeated.

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

Difference between the number of paper cranes that Gabby and Vanessa folded in the end
= (1 u + 51) - (1 u + 1)
= 1 u + 51 - 1 u - 1
= 51 - 1
= 50

5 p = 50

1 p = 50 ÷ 5 = 10

Number of paper cranes that Vanessa folded
= 2 p
= 2 x 10
= 20

Answer(s): 20