The cost of 2 bottles of water and 4 apples is $\$5.50$. The cost of 3 bottles ofwater and 5 apples is $\$7.50$. Find the cost of one apple and the cost of one bottle of water
We can write two equations, and solve for w and a which represent bottles of water and apples respectively.
We have
2w+4a=5.5
3w+5a=7.5
6w+12a=16.5
6w+10a=15
2a=1.5
a=$\boxed{\$0.75}$
2w+3=5.5
2w=2.5
w=$\boxed{\$1.25}$