The number of safety cones along the road was 80% of the number of trees planted along it. After 72 safety cones and 72 trees were added to the stretch of road, the number of trees became 15% more than the number of safety cones. How many trees were there at first?
|
Safety Cones |
Trees |
Difference |
Before |
4x3 = 12 u |
5x3 = 15 u |
1x3 = 3 u |
Change |
+ 72 |
+ 72 |
|
After |
20x1 = 20 u |
23x1 = 23 u |
3x1 = 3 u |
80% =
80100 =
45Number of safety cones in the end in percentage = 100%
Number of trees in the end in percentage
= 100% + 15%
= 115%
115% =
115100 =
2320 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 1 and 3 is 3.
Number of safety cones added
= 20 u - 12 u
= 8 u
8 u = 72
1 u = 72 ÷ 8 = 9
Number of trees at first
= 15 u
= 15 x 9
= 135
Answer(s): 135