book Maths Puzzle Numerical Ability

Can you please help me solve this problem? I would greatly appreciate your help!

2x/5 + 27/10 + 4x/5
Thank you!

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book Other Question

Suppose you have a three quart pail and an eight quart pail with no marking on either pail. How can you use these pails to get exactly four quarts of water in the largest pail? What is the solution to

((cuberoot 2) raised to the 2 -x) = 2 raised to the x^2