book
Maths Puzzle
Numerical Ability
(-7)x(+3)= the answers are....-4, -21, -10, or 4
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book Other Question
If p+r = 2q and 1/q + 1/s = 2r ; then prove that p:q = r:s
3*(4xy)*(5)
divided by
2*(3x)*(4y)