Question
1
visibility
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.