exam Maths Puzzle Numerical Ability

The length of a rectangle is 1cm longer than its width. If the diagonal of the rectangle is 4cm, what are the dimensions(the length and width) of the rectangle?

x + (x+1)= 4

Am I on the right track in solving this problem?

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exam Other Question
How many gallons of a 55% solution must be mixed with a 75 gallons of 20% solution to obtain 30% solution? [(8+5)(6-2)^2]-(4*17/2)
----------------------- <-- divided by
[(24/3)/3}

thanks you ps im not goin to reply back sayin thank you because i alrady did ;]