PSLE
Fiona and Gem folded paper balls over two days. On Thursday, Fiona folded 30 paper balls more than Gem. On Friday, Fiona folded another 10 paper balls and Gem folded another 8. At the end of the two days, Fiona made ⁷₁₀ of the total number of balls. What was the number of paper balls that Gem folded?

	Fiona	Gem	Difference
Before	1 u + 30	1 u	30
Change	+ 10	+ 8
After	1 u + 40	1 u + 8	32
Comparing between Fiona and Gem in the end	7 p	3 p	4 p

Difference between the number of paper balls that Fiona and Gem folded in the end is repeated.

Difference between the number of paper balls that Fiona and Gem folded in the end
= 7 p - 3 p
= 4 p

Difference between the number of paper balls that Fiona and Gem folded in the end
= (1 u + 40) - (1 u + 8)
= 1 u + 40 - 1 u - 8
= 40 - 8
= 32

4 p = 32

1 p = 32 ÷ 4 = 8

Number of paper balls that Gem folded
= 3 p
= 3 x 8
= 24

Answer(s): 24