Verbal Reasoning - Mental Ability Questions

In the following question, select the missing number from the given series.
1, 3, 6, 10, 15, ?

If A is the mother of B and K, D is the husband of A. E is the son of D's brother. What is the relation of A with E

There are 45 trees in a row. The lemon tree is 20th from right end. What is the rank of lemon tree from left end?

In the following question, select the missing number from the given series.146, 137, 128, ?, 110, 101

If REDUCE= 56, RECYCLE = 71 then REUSE=?

Deepak introduces Raju saying, "He is the husband of the granddaughter of the father of my father." How is Raju related to Deepak?

If "S" denotes "multiplied by", "V" denotes "subtracted from", "M" denotes "added to" and "L" denotes "divided by", then

5 V 9 M 63 L 9 S 7 = ?

Find the next term for the series given below: 5G, 6H, 7I, 8J , ?