exam Maths Puzzle Numerical Ability

2
8t +20t-12=0 That is supposed to read 8t squared. I need to solve the equation(i.e. x=4 or 6)

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2/3a - 5 + 8/9a = -19 PLEASE HELP ME! 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?