Oil in a tank - Math Central

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Question from tanakura, a student:

an oil tank contain 208.3 gallons of oil .whenever the amount of oil drops below 70 gallons,an alarm sound
.if 153.4 gallons are pumped into a delivery truck ,how many gallons must be pumped back into the tank in order to shut of the alarm?

Tanakura,

There are 208.3 gallons in the tank and 153.4 gallons are pumped out. How much remains? How much do you need to add to that to make 70 gallons?

Penny

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