MHB How Many Tables Are Available at a Restaurant?

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A restaurant has 120 tables, with 30% reserved, leaving 70% available. To calculate the available tables, multiply 120 by 70%, which equals 84 tables. A breakdown method suggests first calculating 10% of 120, which is 12, and then multiplying by 7 to find 70%. This approach simplifies the math for those who cannot use a calculator. Ultimately, 84 tables are available for customers.
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A restaurant has 120 tables, but 30% of them are reserved how many tables are available. I cannot use a calculator so need the break down. I know this seems simple but have not used math in a very long time.
 
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Mary said:
A restaurant has 120 tables, but 30% of them are reserved how many tables are available. I cannot use a calculator so need the break down. I know this seems simple but have not used math in a very long time.

Hi Mary! Welcome to MHB! (Smile)

If 30% are reserved, that means that 70% are available, since we have a total of 100%.
It means that we have $120 \times 70\%$ tables available.
How many would that be? (Wondering)
 
Mary said:
A restaurant has 120 tables, but 30% of them are reserved how many tables are available. I cannot use a calculator so need the break down. I know this seems simple but have not used math in a very long time.
Since you cannot use a calculator, here's a "trick":
assume 10%; that's easy enough; example:
10% of 400 = 40 (divide by 10).
So 30% = 120 (3 times more).
Get my drift?
 

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