TCS Company Numerical Ability Algebra

If there are only 2 wheelers and 4 wheelers parked in a school located at the heart of the city, find the number of 4 wheelers parked there if the total number of wheels is 58?

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TCS Other Question

If 10 boys meet at a reunion and each boy shakes hands exactly once with each of the others, then what is the total number of handshakes Find the value of sin 75° + sin 15° = ?
cos 75° + cos 15° =?