There was an equal number of starfruits and kiwis. On Saturday, some starfruits were added, such that the number of starfruits increased by 80%. On Sunday, the number of starfruits further increased by 50% and the number of kiwis decreased by 20%. There were 171 more starfruits than kiwis in the end. How many starfruits and kiwis were there altogether at first?

	Starfruits	Kiwis
Before	1 u	1 u
Change 1	+ 0.8 u	No change
After 1	1.8 u	1 u
Change 2	+ 0.9 u	- 0.2 u
After 2	2.7 u	0.8 u

Number of starfruits added on Saturday
= 80% x 1 u
= ⁸⁰₁₀₀ x 1 u
= 0.8 u

Number of starfruits increased on Sunday
= 50% x 1.8 u
= ⁵⁰₁₀₀ x 1.8 u
= 0.9 u

Number of kiwis decreased on Sunday
= 20% x 1 u
= ²⁰₁₀₀ x 1 u
= 0.2 u

Number of more starfruits than kiwis in the end
= 2.7 u - 0.8 u
= 1.9 u

1.9 u = 171

1 u = 171 ÷ 1.9 = 90

Total number of starfruits and kiwis at first
= 1 u + 1 u
= 2 u
= 2 x 90
= 180

Answer(s): 180