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: x/2y=2a, then 2x/x-2ay=?

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TCS Other Question

: Mr. Das has 3 sons whose ages are respectively a, b, c. The grandfather has bought a cycle for the eldest son, mother has bought a bag for the youngest one which cost Rs. 150/. The sum of two age of the elder son and one son is 15. The difference of the age of sons is 3 & 2. Then what of the age of the elder son?
a) 10, b) 11, c) 12, d) 13
Mr. behera wants to build a house for his wife. In this there are 5 rooms each having equal area. The length of each room is 4m,, breadth is 5m. The height of the rooms is 2m. If to make a sq meter we need 17 bricks, then how many bricks are needed to make the floor of a particular room?