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 25% 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 |
4x2 = 8 u |
5x2 = 10 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% + 25%
= 125%
125% =
125100 =
54 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
= 8 u - 3 u
= 5 u
5 u = 70
1 u = 70 ÷ 5 = 14
Number of trees at first
= 5 u
= 5 x 14
= 70
Answer(s): 70