book Maths Puzzle Numerical Ability

if y varies inversly as x and y=2 when x=1 find x when y=4
x=_____
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book Other Question

solve inequalities.
A. x^3-x^2-4x+4<0
B.3x^2-7x+2 <0
x+1 BOB AND MARY TOGETHER SELL 22 APPLES
BOB AND DON SELL 14 APPLES
DON AND MARY SELL 16 APPLES
HOW MANY DID EACH SELL? THANK YOU