PSLE
Risa and Jade folded paper balls over two days. On Thursday, Risa folded 17 paper balls more than Jade. On Friday, Risa folded another 38 paper balls and Jade folded another 27. At the end of the two days, Risa made ⁵₈ of the total number of balls. What was the number of paper balls that Risa folded?

	Risa	Jade	Difference
Before	1 u + 17	1 u	17
Change	+ 38	+ 27
After	1 u + 55	1 u + 27	28
Comparing between Risa and Jade in the end	5 p	3 p	2 p

Difference between the number of paper balls that Risa and Jade folded in the end is repeated.

Difference between the number of paper balls that Risa and Jade folded in the end
= 5 p - 3 p
= 2 p

Difference between the number of paper balls that Risa and Jade folded in the end
= (1 u + 55) - (1 u + 27)
= 1 u + 55 - 1 u - 27
= 55 - 27
= 28

2 p = 28

1 p = 28 ÷ 2 = 14

Number of paper balls that Risa folded
= 5 p
= 5 x 14
= 70

Answer(s): 70