self Maths Puzzle

f x = 3 + 22, then the value of x - 1 is:
x
A. 1 B. 2
C. 22 D. 33

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self Other Question

xb (b + c - a) . xc (c + a - b) . xa (a + b - c) = ?
xc xa xb
A. xabc B. 1
C. xab + bc + ca D. xa + b + c Two ships are sailing in the sea on the two sides of a lighthouse. The angle of elevation of the top of the lighthouse is observed from the ships are 30º and 45º respectively. If the lighthouse is 100 m high, the distance between the two ships is:

A. 173 m B. 200 m
C. 273 m D. 300 m