PSLE
Opal and Fiona folded paper balls over two days. On Friday, Opal folded 46 paper balls more than Fiona. On Saturday, Opal folded another 14 paper balls and Fiona folded another 12. At the end of the two days, Opal made ⁷₁₀ of the total number of balls. What was the number of paper balls that Opal folded?

	Opal	Fiona	Difference
Before	1 u + 46	1 u	46
Change	+ 14	+ 12
After	1 u + 60	1 u + 12	48
Comparing between Opal and Fiona in the end	7 p	3 p	4 p

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

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

Difference between the number of paper balls that Opal and Fiona folded in the end
= (1 u + 60) - (1 u + 12)
= 1 u + 60 - 1 u - 12
= 60 - 12
= 48

4 p = 48

1 p = 48 ÷ 4 = 12

Number of paper balls that Opal folded
= 7 p
= 7 x 12
= 84

Answer(s): 84