exam Maths Puzzle Numerical Ability

1).The area of the floor of the rectangle room shown is 175 square feet. The lenght of the room is 1 1/2 longer than the width. Find the lenght of the room?
Area = 175 square feet

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Tutor could you please help me with the following problem: x+4y=16

If both x and y are positive integers in this equation, how many different values can x have? (1,2, 3 or 4) I chose 3..am I correct?

Thank you for your help! How to solve this equation?3(4y+2)= 2(1+5y)+8