At the stadium were some adults.
12 of the number of tourists was equal to 2 times the number of locals. When another 61 locals entered and 42 tourists left, the ratio of the number of tourists to the number of locals become 5 : 4. Find the number of tourists at the stadium at first.
|
Make p the same (1)x4 = (3) |
Tourists (1) |
Locals (2) |
Make p the same (2)x5 = (4) |
Before |
16 u |
4 u |
1 u |
5 u |
Change |
- 168 |
- 42 |
+ 61 |
+ 305 |
After |
20 p |
5 p |
4 p |
20 p |
12 of the tourists = 2 times of the locals
1x22x2 of the tourists =
2x11x1 of the locals
Make the numerators the same. LCM of 1 and 2 is 2.
24 of the tourists =
21 of the locals
Tourists : Locals = 4 : 1
Make p the same.
(3) = (4)
16 u - 168 = 5 u + 305
16 u - 5 u = 305 + 168
11 u = 473
1 u = 473 ÷ 11 = 43
Number of tourists at the stadium at first
= 4 u
= 4 x 43
= 172
Answer(s): 172