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Determine the number that makes the equation true.

15 + = 25 – 9

 

  • A

    9

  • B

    1 

  • C

    3

  • D

    4

The correct answer is 1.

Solution:
Consider the given equation.
15 + = 25 – 9

To determine the missing number, we need to find: 25 – 9.

Which gives:
25 - 9 = 16

So,
15 + = 25 – 9

15 + = 16

Next, we look for the number which when added to 15 gives 16.

Note that,
15 + 1 = 16

Then,
15 + 1 = 25 – 9

So, number 1 makes the equation true.