The number of safety cones along the road was 65% of the number of trees planted along it. After 62 safety cones and 62 trees were added to the stretch of road, the number of trees became 30% more than the number of safety cones. How many trees were there at first?

	Safety Cones	Trees	Difference
Before	13x3 = 39 u	20x3 = 60 u	7x3 = 21 u
Change	+ 62	+ 62
After	10x7 = 70 u	13x7 = 91 u	3x7 = 21 u

65% = ⁶⁵₁₀₀ = ¹³₂₀

Number of safety cones in the end in percentage = 100%

Number of trees in the end in percentage
= 100% + 30%
= 130%

130% = ¹³⁰₁₀₀ = ¹³₁₀ 

Since the number of safety cones and trees added is the same, the difference in the number of safety cones and trees remains unchanged. LCM of 7 and 3 is 21.

Number of safety cones added
= 70 u - 39 u
= 31 u

31 u = 62

1 u = 62 ÷ 31 = 2

Number of trees at first
= 60 u
= 60 x 2
= 120

Answer(s): 120