Question
1
visibility
Determine the number that makes the equation true.
21 + 18 = 50 –
-
A
14
-
B
15
-
C
19
-
D
11
The correct answer is 11.
Solution:
Consider the given equation.
21 + 18 = 50 –
To determine the missing number, we need to find: 21 + 18.
Which gives:
21 + 18 = 39
So,
21 + 18 = 50 –
39 = 50 -
Next, we look for the number which when subtracted from 50 gives 39.
Note that,
50 - 11 = 39
Then,
21 + 18 = 50 - 11
So, number 11 makes the equation true.