Gerald had 20 toy cars. He donated 1/4 of his toy cars to an orphanage. How many toy cars does Gerald have left?
Gerald gave away 20 x 1/4 = <<20*1/4=5>>5 of his toy cars.
Therefore, he is left with 20 - 5 = <<20-5=15>>15 toy cars.
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Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
You are solving math problems. Here are some examples of how to solve the task:

A building has 300 units. Half the units are residential and the other half are split evenly between offices and restaurants. How many restaurants are there in the building?There are 300/2 = <<300/2=150>>150 units for offices and restaurants.
There are 150/2 = <<150/2=75>>75 restaurants in the building.
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Donny saves $15 on Monday, $28 on Tuesday and $13 on Wednesday. On Thursday he spends half of his total savings so far. How much did he spend?Donny saves a total of $15+$28+$13 = $<<15+28+13=56>>56 across all 3 days
He spends half of his total savings which is $56*(1/2) = $<<56*(1/2)=28>>28
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Now, solve this next question in the style of the above examples:

Gerald had 20 toy cars. He donated 1/4 of his toy cars to an orphanage. How many toy cars does Gerald have left?

### Response:
Gerald gave away 20 x 1/4 = <<20*1/4=5>>5 of his toy cars.
Therefore, he is left with 20 - 5 = <<20-5=15>>15 toy cars.
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