book Maths Puzzle Numerical Ability

a parent who has not had to use this math since high school and my son came to me for help, Help!!! heres two types of problems he has to do 3(6+4) = 3(___)+ 3(4) and my son has to do some simplifys 12(x + 2) or 9 (p - 6)

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A survey was made on the smoking habits of the male population above 18 years old of a certain community. The survey was on three cigarettes A, B and C. The following was the resul Find the radius of an inscribed circle in a triangle with legs 12, 12, 8.