PSLE
Kylie and Olivia folded paper cranes over two days. On Thursday, Kylie folded 63 paper cranes more than Olivia. On Friday, Kylie folded another 17 paper cranes and Olivia folded another 28. At the end of the two days, Kylie made ⁷₁₀ of the total number of cranes. What was the number of paper cranes that Olivia folded?

	Kylie	Olivia	Difference
Before	1 u + 63	1 u	63
Change	+ 17	+ 28
After	1 u + 80	1 u + 28	52
Comparing between Kylie and Olivia in the end	7 p	3 p	4 p

Difference between the number of paper cranes that Kylie and Olivia folded in the end is repeated.

Difference between the number of paper cranes that Kylie and Olivia folded in the end
= 7 p - 3 p
= 4 p

Difference between the number of paper cranes that Kylie and Olivia folded in the end
= (1 u + 80) - (1 u + 28)
= 1 u + 80 - 1 u - 28
= 80 - 28
= 52

4 p = 52

1 p = 52 ÷ 4 = 13

Number of paper cranes that Olivia folded
= 3 p
= 3 x 13
= 39

Answer(s): 39