PSLE
Gabby and Eva folded paper balls over two days. On Wednesday, Gabby folded 28 paper balls more than Eva. On Thursday, Gabby folded another 19 paper balls and Eva folded another 2. At the end of the two days, Gabby made ⁷₉ of the total number of balls. What was the number of paper balls that Gabby folded?

	Gabby	Eva	Difference
Before	1 u + 28	1 u	28
Change	+ 19	+ 2
After	1 u + 47	1 u + 2	45
Comparing between Gabby and Eva in the end	7 p	2 p	5 p

Difference between the number of paper balls that Gabby and Eva folded in the end is repeated.

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

Difference between the number of paper balls that Gabby and Eva folded in the end
= (1 u + 47) - (1 u + 2)
= 1 u + 47 - 1 u - 2
= 47 - 2
= 45

5 p = 45

1 p = 45 ÷ 5 = 9

Number of paper balls that Gabby folded
= 7 p
= 7 x 9
= 63

Answer(s): 63