exam Maths Puzzle Numerical Ability

A man is 30 years old and his son is 13 years old. In how many years will the son be 3/4s as old as his father?

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8t +20t-12=0 That is supposed to read 8t squared. I need to solve the equation(i.e. x=4 or 6)
miles price

0-1 mile $0.50
2-5 miles $2.25
over 5 miles $4.75
relay $0.75

A carrier drove his c