Question

Look at this series: 80, 10, 70, 15, 60, ... What number should come next?

Answer 1

Hey there!! 

If we observe the patter each alternative number has a continuos patter between them. The first number is 80, and the number alternative to 80 is 70 followed by 60. Here the difference between the numbers is 10. Secondly, if we look at 10 the alternative is 15, showing the difference of 5. Hence the next number should be 20. 

Answer= 20

Answer 2

It will be 20 bcz the numbers are increasing with 5