The number is 4
Step-by-step explanation:
First of all we have to convert the given statement in mathematical form.
Let c be the number then according to given statement

We have to isolate the variable in the equation
Dividing both sides by 2

Adding 3 on both sides

Hence,
The number is 4
Keywords: Linear equation, variables
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Answer:
total amount paid = 32.5 + 28.9 + 24.95 = 86.35
20% of the total amount paid = 0.2 * 86.35 = 17.27
you tip 17.25$
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