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Maths Puzzle
Numerical Ability
How much pure acid should be mixed with 2 gallons of a 40% acid solution in order to get a 70% acid solution?
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book Other Question
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
what does r equal in this equation : 8r+3=5r+12?
also what does p equal in this equation : 9p-14=4p+11?