Question: What is the next number in the series?
10, 20, 30, 50, 80, ?
(A) 100
(B) 120
(C) 130
(D) 150
Solution:
The differences are:
20 – 10 = 10
30 – 20 = 10
50 – 30 = 20
80 – 50 = 30
The differences are: 10, 10, 20, 30 (which increase by 10, then by 10).
Next difference:30+40=70.
Next term:80+70=150.
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