Question

Four bottles of water and three cups of coffee cost $10.85. Four bottles of water and six cups of coffee cost $16.70. How much does each cost?

Answer 1

each water is $1.25 each coffee is $1.95

Explanation:

we know that the difference between $10.85 and $16.70 is 3 cups of coffee

if we subtract $10.85 from $16.70 we get $5.85

$5.85 divided by 3 is $1.95

so each cup of coffee is $1.95

now we subtract the same $5.85 from the price of 4 waters and 3 coffees

$10.85 minus $5.85 equals $5.00

divide that by 4 to get the price of each water bottle and you get $1.25 per water