book Maths Puzzle Numerical Ability

I need help with four problems: I need to write a variable expression for each word phrase:
Problem 1: five less than y
Problem 2:the product of a number and 78
Problem 3:the quotient of a number and 9
Problem 4:ten increased by a number

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book Other Question

3(x+2)+7=12 How much pure acid should be mixed with 2 gallons of a 40% acid solution in order to get a 70% acid solution?