The number of safety cones along the road was 60% of the number of trees planted along it. After 70 safety cones and 70 trees were added to the stretch of road, the number of trees became 20% more than the number of safety cones. How many trees were there at first?
|
Safety Cones |
Trees |
Difference |
Before |
3x1 = 3 u |
5x1 = 5 u |
2x1 = 2 u |
Change |
+ 70 |
+ 70 |
|
After |
5x2 = 10 u |
6x2 = 12 u |
1x2 = 2 u |
60% =
60100 =
35Number of safety cones in the end in percentage = 100%
Number of trees in the end in percentage
= 100% + 20%
= 120%
120% =
120100 =
65 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 1 is 2.
Number of safety cones added
= 10 u - 3 u
= 7 u
7 u = 70
1 u = 70 ÷ 7 = 10
Number of trees at first
= 5 u
= 5 x 10
= 50
Answer(s): 50