There was an equal number of guavas and starfruits. On Friday, some guavas were added, such that the number of guavas increased by 60%. On Saturday, the number of guavas further increased by 50% and the number of starfruits decreased by 20%. There were 80 more guavas than starfruits in the end. How many guavas and starfruits were there altogether at first?

	Guavas	Starfruits
Before	1 u	1 u
Change 1	+ 0.6 u	No change
After 1	1.6 u	1 u
Change 2	+ 0.8 u	- 0.2 u
After 2	2.4 u	0.8 u

Number of guavas added on Friday
= 60% x 1 u
= ⁶⁰₁₀₀ x 1 u
= 0.6 u

Number of guavas increased on Saturday
= 50% x 1.6 u
= ⁵⁰₁₀₀ x 1.6 u
= 0.8 u

Number of starfruits decreased on Saturday
= 20% x 1 u
= ²⁰₁₀₀ x 1 u
= 0.2 u

Number of more guavas than starfruits in the end
= 2.4 u - 0.8 u
= 1.6 u

1.6 u = 80

1 u = 80 ÷ 1.6 = 50

Total number of guavas and starfruits at first
= 1 u + 1 u
= 2 u
= 2 x 50
= 100

Answer(s): 100