Study the given pattern carefully and select the number that can replace the question mark (?) in it. First row – 15, 11, 43
Second row – 13, 8, 30
Third row – 9, 7, ?
(NOTE : Operations should be performed on the whole numbers, without breaking down the numbers into its constituent digits. E.g. 13 – Operations on 13 such as adding / subtracting / multiplying etc. to 13 can be performed. Breaking down 13 into 1 and 3 and then performing mathematical operations on 1 and 3 is NOT allowed)
A. 19
B. 23
C. 27
D. 28
Sol:
Pattern follows here is:
If A : B : C =
C=2A+3B-20
So the required number is 18 + 21 – 20 = 19.
