The number of safety cones along the road was 65% of the number of trees planted along it. After 72 safety cones and 72 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 |
13x2 = 26 u |
20x2 = 40 u |
7x2 = 14 u |
Change |
+ 72 |
+ 72 |
|
After |
5x7 = 35 u |
7x7 = 49 u |
2x7 = 14 u |
65% =
65100 =
1320Number 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 7 and 2 is 14.
Number of safety cones added
= 35 u - 26 u
= 9 u
9 u = 72
1 u = 72 ÷ 9 = 8
Number of trees at first
= 40 u
= 40 x 8
= 320
Answer(s): 320