book Maths Puzzle Numerical Ability

I'M HAVING PROBLEMS WITH:3h+6<33 also please respond asap.

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How to solve this equation?


4(n+3)=2(6+2n)
a car and a van are parked one hundred twenty miles apart on a straight road the drivers started driving towards each other at noon each at a speed of 40 mi/hr a fly starts from th