book Maths Puzzle Numerical Ability

4x/5=2x/7

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Hello. My name is kate and i was wondering if you could help me understand and complete these two problems.
For the expression 2x^2 - 5x + 2
A.Find the value of x if the
Suppose you have $350.62 to spend on a remodeling project. The floor tiles and curtains cost $180. Determine the amount of paint you can buy, in gallons, if the paint costs $13.50 per gallon.