The expression that can be used to represent the amount of money they had leftover will be 300 - 20H - 20S.
Therefore, the equation to solve the question will be:
= 300 - (20 Ă— H) - (20 Ă— S)
= 300 - 20H - 20S
In conclusion, the correct option is 300 - 20H - 20S.
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