Below you will see a series of equations, where the operator is used differently. Find the usage of the operator in the first 3 equations and then find the missing number in the last equation.
If,
1 + 4 = 5
2 + 5 = 12
3 + 6 = 21
Then,
5 + 8 = ?
Have you find the answer?
Check bellow:
Answer: 45
Explanation:
So we have the following equations;
1 + 4 = 5
2 + 5 = 12
3 + 6 = 21
of the form;
a + b = c
So we can find the actual operations are as follows;
a x (b + 1) = c
So in the equations let’s see if this is followed;
1 + 4 = 5 :: 1 x (4 + 1) = 1 x 5 = 5
2 + 5 = 12 :: 2 x (5 + 1) = 2 x 6 = 12
3 + 6 = 21 :: 3 x (6 + 1) = 3 x 7 =21
Therefore, if we apply the same to the equation with the missing number we can find the result;
5 + 8 = ? :: 5 x (8 + 1) = 5 x 9 = 45
Hence,
Answer = 45.
