Elitmus Exam Numerical Ability Age Problem

kunti had 4 sons. each sibling is either 1 year older or younger.she multiply their ages and write in a diary. all born on 1st april year different. ques was lyk dis..
multiplication f agees will be..
option..
1. prime number +1.
2.a square number -1.
3. divisible by 10 always.
4.divisible by previous number.

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A, B and C working together completed a job in 10 days. However C only worked for the first three days when 37/100 of the job was done. Also, the work done by A in 5 days equals the work done by B in 4 days. How many days will the fastest worker take to complete the given work alone?
20 days 25 days 30 days 40 days...........