Find the number missing at question mark

10, 14, 23, 39, 64, ? , 149

Find the right number, from the given options, at the place marked by the question mark: 2, 4, 8, 32, 256 ?

In an examination 40% of the students failed in Mathematics, 30% in English and  15% in both. Find the percentage of pass in both

What will be xy if 7862xy is to be divisible by 125?

How many ‘7' s are there in the following series which are not immediately followed by ‘3’ but immediately followed by ‘3 but immediately preceded by 8?

898762263269732872778737794

If 3 ×4 = 25, 5 × 6 = 61, 6 × 7 = 85 then 9 × 10 = ?