Answer: There are 22 adults , 12 children and 11 senior citizens on the tour bus.
Explanation:
Let adult = x
children = y
senior citizen = z
Given : Total busload (x+ y + z) = 45
Total charge on day 1 = 558 $ =
![15* x+8* y+12* z](https://img.qammunity.org/2022/formulas/mathematics/college/4jg9561e7gr1d8f3f29pd8g46b4hakithz.png)
Total charge on day 2 = 771 $ =
![20* x+12* y+17* z](https://img.qammunity.org/2022/formulas/mathematics/college/7n7nwi67a6rnrppxfgp772fidrlqiasd5i.png)
Now we have 3 equations : x+ y+z =45
![15* x+8* y+12* z=558](https://img.qammunity.org/2022/formulas/mathematics/college/9zluc9i4wr4cdqpzm1znty1bjfve8qlek2.png)
![20* x+12* y+17* z=771](https://img.qammunity.org/2022/formulas/mathematics/college/mcoy9ylf2kuf0ccx9n7nhdqln9vi68yuoy.png)
Solving for them we get: x= 22 , y = 12 and z= 11
Thus there are 22 adults , 12 children and 11 senior citizens.