The number of safety cones along the road was 60% 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 15% more than the number of safety cones. How many trees were there at first?
|
Safety Cones |
Trees |
Difference |
Before |
3x3 = 9 u |
5x3 = 15 u |
2x3 = 6 u |
Change |
+ 62 |
+ 62 |
|
After |
20x2 = 40 u |
23x2 = 46 u |
3x2 = 6 u |
60% =
60100 =
35Number 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 2 and 3 is 6.
Number of safety cones added
= 40 u - 9 u
= 31 u
31 u = 62
1 u = 62 ÷ 31 = 2
Number of trees at first
= 15 u
= 15 x 2
= 30
Answer(s): 30