PSLE
Ivory and Sarah folded paper stars over two days. On Saturday, Ivory folded 30 paper stars more than Sarah. On Sunday, Ivory folded another 24 paper stars and Sarah folded another 12. At the end of the two days, Ivory made ⁵₇ of the total number of stars. What was the number of paper stars that Ivory folded?

	Ivory	Sarah	Difference
Before	1 u + 30	1 u	30
Change	+ 24	+ 12
After	1 u + 54	1 u + 12	42
Comparing between Ivory and Sarah in the end	5 p	2 p	3 p

Difference between the number of paper stars that Ivory and Sarah folded in the end is repeated.

Difference between the number of paper stars that Ivory and Sarah folded in the end
= 5 p - 2 p
= 3 p

Difference between the number of paper stars that Ivory and Sarah folded in the end
= (1 u + 54) - (1 u + 12)
= 1 u + 54 - 1 u - 12
= 54 - 12
= 42

3 p = 42

1 p = 42 ÷ 3 = 14

Number of paper stars that Ivory folded
= 5 p
= 5 x 14
= 70

Answer(s): 70