what is the answer to this question?
'1/4 of a year'
Answers
Answer:
The question above, being a problem in mental arithmetic, should be solved mentally in a few seconds.
The mathematics behind the mental processes involved is as follows:
Multiply the first two digits on the left of the equation and then add to this result the first number on the left. The result is the RHS. The number of operations involved is only 2, one is multiplication and the second addition.
Thus in the first equality 1+4 = 5, the first two digits are 1 and 4. Multiply them to get the result 4. Then add the first digit 1 to this 4. The result is 5, the RHS. In the same manner, for the second equality, we write, 2x5=10 and 10+2=12, the RHS. For the third equality, it is (3x6) + 3 = 18 + 3 = 21.
Applying the above rule to evaluate 5+8, we write 5x8=40 and then add 5 to it to arrive at the answer 45.
__CUTExCHIRAG.