PSLE
Ivory and Olivia folded paper cranes over two days. On Monday, Ivory folded 4 paper cranes more than Olivia. On Tuesday, Ivory folded another 27 paper cranes and Olivia folded another 7. At the end of the two days, Ivory made ⁷₁₀ of the total number of cranes. What was the number of paper cranes that Ivory folded?

	Ivory	Olivia	Difference
Before	1 u + 4	1 u	4
Change	+ 27	+ 7
After	1 u + 31	1 u + 7	24
Comparing between Ivory and Olivia in the end	7 p	3 p	4 p

Difference between the number of paper cranes that Ivory and Olivia folded in the end is repeated.

Difference between the number of paper cranes that Ivory and Olivia folded in the end
= 7 p - 3 p
= 4 p

Difference between the number of paper cranes that Ivory and Olivia folded in the end
= (1 u + 31) - (1 u + 7)
= 1 u + 31 - 1 u - 7
= 31 - 7
= 24

4 p = 24

1 p = 24 ÷ 4 = 6

Number of paper cranes that Ivory folded
= 7 p
= 7 x 6
= 42

Answer(s): 42