TCS Company Numerical Ability Algebra

One grand father has 3 grand children two of the age difference is 3.Eldest child age is 3 times the youngest childs age and the eldest child age is two year more than the sum of other two children. Find what is the age of the elders child?
a)18 b)22 c)30 d)10

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TCS Other Question

One man want to build a wall .The length and breadth of the wall are 20 and 30 respectively. He need 35 bricks for one square centimeter then how many bricks he need?
a)21,500 b)30,000 c)21,000 d)20,000
3 persons A, B, C were there. A always says truth, B lies on monday, tuesday and wednesday but C lies on thrusday, friday & saturday. one day A said that B & C said to A, that B said yesterday was one of the days when I lies. C said that yesterday was one of the days when I lies too then which day was that?
a) Sunday
b) Thursday
c) Saturday
d) Tuesday