Question

Joan waters her plants each day with gallons of water. With a new irrigation system in place, she uses gallons of water each day. How many gallons of water does she save in a 30-day period with the irrigation system?

Answer 1

`172(1)/(2)` gallons

Explanation:

Considering she waters her plants with 25 1/2 gallons i.e 51/2

and with the new system, she does it with 19 3/4 i.e 79/4

taking the difference:

`(51)/(2) - (70)/(4)` =
`(23)/(4)` gallons per day

For 30 days:

30 x
`(23)/(4)` = 172.5 or
`172(1)/(2)` gallons