exam Maths Puzzle Numerical Ability

Can you find three consecutive odd numbers that are prime numbers? And is it possible to find another set of three consecutive odd numbers that are prime. Explain

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exam Other Question

My car gets 12 miles per gallon of gasolene. Gas is 4$/gallon.
If I buy a car that gets 16 miles per gallon at a cost of $500, how long or how many miles will it take me to pay for it with savings of gas cost?

Help please,
Bob please tell me how to graph -3/5. Do you go over 5 or -5?