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Determine the number that makes the equation true.

+ 9 = 31 – 6

  • A

    16

  • B

    14

  • C

    17

  • D

    20

The correct answer is 16.


Solution:
Consider the given equation.
+ 9 = 31 – 6

To determine the missing number, first, we need to find: 31 – 6.

Which gives:
31 - 6 = 25

Then,
 + 9 = 31 – 6

 + 9 = 25

Next, to find the missing number we find: 25 – 9.

Which gives:
25 – 9 = 16

So,
16 + 9 = 31 – 6

That is, number 16 makes the equation true.