Malia has saved $18.50 to buy a hamster cage that costs $30. which equation can she use to find s, the additional amount she needs to save?

They give you the whole entire worth of the cage and it 30. so I believe it is s + 18.50= 30
Worked out
s + 18.50= 30
-18.50. 18.50
s = 11.50

Ithink you're supposed to multiply 12.50 which is how much he makes per hour and then multiply it by each number then add whats left togrther and there's your answer