The number of safety cones along the road was 50% of the number of trees planted along it. After 51 safety cones and 51 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 |
1x3 = 3 u |
2x3 = 6 u |
1x3 = 3 u |
Change |
+ 51 |
+ 51 |
|
After |
20x1 = 20 u |
23x1 = 23 u |
3x1 = 3 u |
50% =
50100 =
12Number 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 - 3 u
= 17 u
17 u = 51
1 u = 51 ÷ 17 = 3
Number of trees at first
= 6 u
= 6 x 3
= 18
Answer(s): 18