PSLE
Fiona and Kathy folded paper balls over two days. On Friday, Fiona folded 18 paper balls more than Kathy. On Saturday, Fiona folded another 28 paper balls and Kathy folded another 6. At the end of the two days, Fiona made ⁷₁₀ of the total number of balls. What was the number of paper balls that Fiona folded?

	Fiona	Kathy	Difference
Before	1 u + 18	1 u	18
Change	+ 28	+ 6
After	1 u + 46	1 u + 6	40
Comparing between Fiona and Kathy in the end	7 p	3 p	4 p

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

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

Difference between the number of paper balls that Fiona and Kathy folded in the end
= (1 u + 46) - (1 u + 6)
= 1 u + 46 - 1 u - 6
= 46 - 6
= 40

4 p = 40

1 p = 40 ÷ 4 = 10

Number of paper balls that Fiona folded
= 7 p
= 7 x 10
= 70

Answer(s): 70