There was an equal number of mangosteens and guavas. On Thursday, some mangosteens were added, such that the number of mangosteens increased by 80%. On Friday, the number of mangosteens further increased by 50% and the number of guavas decreased by 30%. There were 140 more mangosteens than guavas in the end. How many mangosteens and guavas were there altogether at first?

	Mangosteens	Guavas
Before	1 u	1 u
Change 1	+ 0.8 u	No change
After 1	1.8 u	1 u
Change 2	+ 0.9 u	- 0.3 u
After 2	2.7 u	0.7 u

Number of mangosteens added on Thursday
= 80% x 1 u
= ⁸⁰₁₀₀ x 1 u
= 0.8 u

Number of mangosteens increased on Friday
= 50% x 1.8 u
= ⁵⁰₁₀₀ x 1.8 u
= 0.9 u

Number of guavas decreased on Friday
= 30% x 1 u
= ³⁰₁₀₀ x 1 u
= 0.3 u

Number of more mangosteens than guavas in the end
= 2.7 u - 0.7 u
= 2 u

2 u = 140

1 u = 140 ÷ 2 = 70

Total number of mangosteens and guavas at first
= 1 u + 1 u
= 2 u
= 2 x 70
= 140

Answer(s): 140