PSLE
Xandra and Gwen folded paper cranes over two days. On Tuesday, Xandra folded 55 paper cranes more than Gwen. On Wednesday, Xandra folded another 12 paper cranes and Gwen folded another 12. At the end of the two days, Xandra made ⁷₉ of the total number of cranes. What was the number of paper cranes that Gwen folded?

	Xandra	Gwen	Difference
Before	1 u + 55	1 u	55
Change	+ 12	+ 12
After	1 u + 67	1 u + 12	55
Comparing between Xandra and Gwen in the end	7 p	2 p	5 p

Difference between the number of paper cranes that Xandra and Gwen folded in the end is repeated.

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

Difference between the number of paper cranes that Xandra and Gwen folded in the end
= (1 u + 67) - (1 u + 12)
= 1 u + 67 - 1 u - 12
= 67 - 12
= 55

5 p = 55

1 p = 55 ÷ 5 = 11

Number of paper cranes that Gwen folded
= 2 p
= 2 x 11
= 22

Answer(s): 22