At the bird park were some adults.
13 of the number of tourists was equal to 2 times the number of locals. When another 76 locals entered and 50 tourists left, the ratio of the number of tourists to the number of locals become 7 : 5. Find the number of tourists at the bird park at first.
|
Make p the same (1)x5 = (3) |
Tourists (1) |
Locals (2) |
Make p the same (2)x7 = (4) |
Before |
30 u |
6 u |
1 u |
7 u |
Change |
- 250 |
- 50 |
+ 76 |
+ 532 |
After |
35 p |
7 p |
5 p |
35 p |
13 of the tourists = 2 times of the locals
1x23x2 of the tourists =
2x11x1 of the locals
Make the numerators the same. LCM of 1 and 2 is 2.
26 of the tourists =
21 of the locals
Tourists : Locals = 6 : 1
Make p the same.
(3) = (4)
30 u - 250 = 7 u + 532
30 u - 7 u = 532 + 250
23 u = 782
1 u = 782 ÷ 23 = 34
Number of tourists at the bird park at first
= 6 u
= 6 x 34
= 204
Answer(s): 204