exam Maths Puzzle Numerical Ability

What does it mean when you have a sum, say for instance: y=2x+10 and it asks you what the value of x is?
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M to 4power(N-3power)/M-2 power)-3power N 0 power (M-4 power N8power)2 power/(N8 power M-2 power)2power A mason can build a wall iin 30 days. After working 24 days, he fell ill and his friend had to finish the wall. he worked for 5 days to finish the wall. How long would it take his friend to do the wall alone?