The number of safety cones along the road was 60% of the number of trees planted along it. After 57 safety cones and 57 trees were added to the stretch of road, the number of trees became 35% more than the number of safety cones. How many trees were there at first?
|
Safety Cones |
Trees |
Difference |
Before |
3x7 = 21 u |
5x7 = 35 u |
2x7 = 14 u |
Change |
+ 57 |
+ 57 |
|
After |
20x2 = 40 u |
27x2 = 54 u |
7x2 = 14 u |
60% =
60100 =
35Number of safety cones in the end in percentage = 100%
Number of trees in the end in percentage
= 100% + 35%
= 135%
135% =
135100 =
2720 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 2 and 7 is 14.
Number of safety cones added
= 40 u - 21 u
= 19 u
19 u = 57
1 u = 57 ÷ 19 = 3
Number of trees at first
= 35 u
= 35 x 3
= 105
Answer(s): 105