Question

One month, Julia collected 8.4 gallons of rain water. That month she used 5.2 gallons to water her garden and 6.5 gallons of rainwater to water her flowers.

a. Write an addition expression to show the change in rainwater.

b. Solve the expression to show how much the rainwater increased or decreased.

Answer 1

3.3 gallons

Step-by-step explanation:

Let $q_{c}$ be the rain water collected bu Julia.

Let $q_{f}$ be the rain water she used for flowers.

Let $q_{g}$ be the rain water she used for garden.

Total rain water used by Julia is $q_{f}+q_{g}$

Total rain water collected by Julia is $q_{c}$

Question a:

Change in rain water=$q_{f}+q_{g}-q_{c}$

Question b:

It is given that $q_{c}=8.4\\q_{f}=6.5\\q_{g}=5.2$

Substituting in the expression gives,

increase in rain water=$6.5+5.2-8.4$$=3.3$