The number of safety cones along the road was 75% of the number of trees planted along it. After 77 safety cones and 77 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 |
4x3 = 12 u |
1x3 = 3 u |
Change |
+ 77 |
+ 77 |
|
After |
20x1 = 20 u |
23x1 = 23 u |
3x1 = 3 u |
75% =
75100 =
34Number 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 - 9 u
= 11 u
11 u = 77
1 u = 77 ÷ 11 = 7
Number of trees at first
= 12 u
= 12 x 7
= 84
Answer(s): 84