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How to make 21 from the numbers 1, 5, 6, 7? You can use the operations of addition, subtraction, multiplication and division, as well as brackets. You must use each number once.

You cannot combine two numbers i.e. 1 and 5 cannot be used as 15

How do you make $21$ from the numbers $1$, $5$, $6$, and $7$?

• You can use the operations of addition, subtraction, multiplication and division, as well as brackets.
• You must use each number exactly once.
• You cannot juxtapose numbers (i.e., 1 and 5 cannot be used as 15).

How to make 21 from the numbers 1, 5, 6, 7? You can use the operations of addition, subtraction, multiplication and division, as well as brackets. You must use each number once.

You cannot combine two numbers i.e. 1 and 5 cannot be used as 15

Hint:

Try to make 1 from 5, 6, 7, 21.

How to make 21 from the numbers 1, 5, 6, 7? You can use the operations of addition, subtraction, multiplication and division, as well as brackets. You must use each number once.

You cannot combine two numbers i.e. 1 and 5 cannot be used as 15