John had $20. He spent 1/5 of his money on snacks and 3/4 of the remaining money on necessities. How much is left of John's money?
John spent $20 x 1/5 = $
<gadget id="calculator">20*1/5</gadget>
<output>4</output>
4 on snacks.
He had $20 - $4 = $
<gadget id="calculator">20-4</gadget>
<output>16</output>
16 remaining.
He spent $16 x 3/4 = $
<gadget id="calculator">16*3/4</gadget>
<output>12</output>
12 on his necessities.
So, John is left with $16 - $12 = $
<gadget id="calculator">16-12</gadget>
<output>4</output>
4.

<result>4</result>