There was an equal number of mangoes and dragonfruits. On Friday, some mangoes were added, such that the number of mangoes increased by 60%. On Saturday, the number of mangoes further increased by 50% and the number of dragonfruits decreased by 30%. There were 17 more mangoes than dragonfruits in the end. How many mangoes and dragonfruits were there altogether at first?

	Mangoes	Dragonfruits
Before	1 u	1 u
Change 1	+ 0.6 u	No change
After 1	1.6 u	1 u
Change 2	+ 0.8 u	- 0.3 u
After 2	2.4 u	0.7 u

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

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

Number of dragonfruits decreased on Saturday
= 30% x 1 u
= ³⁰₁₀₀ x 1 u
= 0.3 u

Number of more mangoes than dragonfruits in the end
= 2.4 u - 0.7 u
= 1.7 u

1.7 u = 17

1 u = 17 ÷ 1.7 = 10

Total number of mangoes and dragonfruits at first
= 1 u + 1 u
= 2 u
= 2 x 10
= 20

Answer(s): 20