The number of safety cones along the road was 50% of the number of trees planted along it. After 69 safety cones and 69 trees were added to the stretch of road, the number of trees became 40% more than the number of safety cones. How many trees were there at first?
|
Safety Cones |
Trees |
Difference |
Before |
1x2 = 2 u |
2x2 = 4 u |
1x2 = 2 u |
Change |
+ 69 |
+ 69 |
|
After |
5x1 = 5 u |
7x1 = 7 u |
2x1 = 2 u |
50% =
50100 =
12Number of safety cones in the end in percentage = 100%
Number of trees in the end in percentage
= 100% + 40%
= 140%
140% =
140100 =
75 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 2 is 2.
Number of safety cones added
= 5 u - 2 u
= 3 u
3 u = 69
1 u = 69 ÷ 3 = 23
Number of trees at first
= 4 u
= 4 x 23
= 92
Answer(s): 92