How Many Tables Are Available at a Restaurant?

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SUMMARY

A restaurant with 120 tables has 30% reserved, leaving 70% available for customers. To calculate the number of available tables, multiply 120 by 0.70, resulting in 84 available tables. The discussion emphasizes a simple method for calculating percentages without a calculator, using the concept of breaking down percentages into manageable parts.

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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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