इस श्रृंखला को देखें: 80, 10, 70, 15, 60, ... आगे कौन सी संख्या आनी चाहिए? , Look at this series: 80, 10, 70, 15, 60, ... What number should come next?

A. 20

B. 25

C. 30

D. 50

Correct Answer :

A. 20

Explanation

This is an alternating addition and subtraction series. In the first pattern, 10 is subtracted from each number to arrive at the next. In the second, 5 is added to each number to arrive at the next.