Six gallons of water splashed out of the wading pool when Santa jumped in. Five gallons splashed out when Mrs. Claus jumped in beside Santa. What number should be added to the original amount in the pool to find how many gallons are left?

x + (-11)

Step-by-step explanation:

so you lost the 6 gallons and 5 gallons. so to find the original amount (I will use x). you need to subtract it from the amount. but since you are being asked to add. you use a negative

x + (-6) + - (5)

or you can combine

x + (-11)

it is equivalent to

x - 11

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