Question

The missing number in the arithmetic sequence 60,51 blank , 33 is

Answer 1

60-51=9
51-9=42
42-9=33
MISSING NUMBER IS 42

Answer 2

Subtract 9 from each number to get the next number.
60 - 9 = 51
51 - 9 = 42
42 - 9 = 33

The number is 42.

Hope this helps =)