The number of safety cones along the road was 50% of the number of trees planted along it. After 78 safety cones and 78 trees were added to the stretch of road, the number of trees became 35% more than the number of safety cones. How many trees were there at first?
|
Safety Cones |
Trees |
Difference |
Before |
1x7 = 7 u |
2x7 = 14 u |
1x7 = 7 u |
Change |
+ 78 |
+ 78 |
|
After |
20x1 = 20 u |
27x1 = 27 u |
7x1 = 7 u |
50% =
50100 =
12Number of safety cones in the end in percentage = 100%
Number of trees in the end in percentage
= 100% + 35%
= 135%
135% =
135100 =
2720 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 7 is 7.
Number of safety cones added
= 20 u - 7 u
= 13 u
13 u = 78
1 u = 78 ÷ 13 = 6
Number of trees at first
= 14 u
= 14 x 6
= 84
Answer(s): 84