Question

A recipe calls for 2 cups of flour for every 5 tablespoons of water. How much flour is needed for 15 tablespoons of water?

Answer 1

the answer is 6

Explanation:

5+5+5=15

2+2+2=6

Answer 2

6 cups of flour

Explanation:

We can use proportion to solve this problem.

Let x be the amount of flour needed for 15 tablespoons of water.

2 cups = 5 tablespoons

x = 15 tablespoons

cross-multiply

5×x = 15×2

5x =30

Divide both-side of the equation by 5

`(5x)/(5)` =
`(30)/(5)`

(On the left-hand side of the equation, 5 at the numerator will cancel-out 5 at the denominator, while on the right-hand side of the equation, 30 will be divided by 5)

x= 6 cups

Therefore 6 cups of flour is needed for 15 tablespoons of water.