exam Maths Puzzle Numerical Ability

there are 20 people in a room. 8 of them are wearing socks and 13 of them are wearing shoes. 4 people are wearing both.how many are barefooted?

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exam Other Question

Suppose it costs $5 to enter a carnival. Each ride costs $1.25. You have $15 to spend at the carnival. What is the greatest number of rides that you can go on?
What is the absolute value of this fraction : (6x+2)/(x-1) all set equal to 4?