Self Maths Puzzle Numerical Ability

21,31,44,92,111,133,133,?

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Self Other Question

There are two friends Nabo and Sona. If Nabo takes 10 days to build a wall and Sona takes 20 days to break the wall.
Find the time taken to build the complete wall when
i) Nabo and Sona are working together.
ii) Nabo and Sona are working on alternate days.
Complete the series:
2 , 11, 28, 53, 86, ?

OPTIONS:
1) 90
2) 98
3) 101
4) 103
5) 104
6) 105
7) 106
8) 111
9) 115
10) 120