PSLE
Erika and Jade folded paper balls over two days. On Friday, Erika folded 61 paper balls more than Jade. On Saturday, Erika folded another 32 paper balls and Jade folded another 18. At the end of the two days, Erika made ⁷₉ of the total number of balls. What was the number of paper balls that Erika folded?

	Erika	Jade	Difference
Before	1 u + 61	1 u	61
Change	+ 32	+ 18
After	1 u + 93	1 u + 18	75
Comparing between Erika and Jade in the end	7 p	2 p	5 p

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

Difference between the number of paper balls that Erika and Jade folded in the end
= 7 p - 2 p
= 5 p

Difference between the number of paper balls that Erika and Jade folded in the end
= (1 u + 93) - (1 u + 18)
= 1 u + 93 - 1 u - 18
= 93 - 18
= 75

5 p = 75

1 p = 75 ÷ 5 = 15

Number of paper balls that Erika folded
= 7 p
= 7 x 15
= 105

Answer(s): 105