Select the set in which the numbers are related in the same way as are the numbers of the following sets.
(NOTE: Operations should be performed on the whole numbers, without breaking downthe 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)
(82,35,78)
(18,27,30)

Correct option is C

Sol.: Logic: (3rd number - 2nd number) + half of the 3rd number = 1st number

Checking the given sets:
1. (82, 35, 78)
Third number = 78, Second number = 35
(78 - 35) + (78 / 2) = 43 + 39 = 82 (Correct)
2. (18, 27, 30)
Third number = 30, Second number = 27
(30 - 27) + (30 / 2) = 3 + 15 = 18 (Correct)
Checking the options:
(a) (21, 27, 24)
Third number = 24, Second number = 27
(24 - 27) + (24 / 2) = -3 + 12 = 9 ≠ 21 (Incorrect)
(b) (15, 36, 38)
Third number = 38, Second number = 36
(38 - 36) + (38 / 2) = 2 + 19 = 21 ≠ 15 (Incorrect)
(c) (27, 33, 40)
Third number = 40, Second number = 33
(40 - 33) + (40 / 2) = 7 + 20 = 27 (Correct)
(d) (20, 25, 32)
Third number = 32, Second number = 25
(32 - 25) + (32 / 2) = 7 + 16 = 23 ≠ 20 (Incorrect)
Thus, the correct answer is option (c).