exam Maths Puzzle Numerical Ability

The difference of two numbers is 91 The second is 5 less than 5 times the first What are the two numbers

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exam Other Question

what is an equtation with one or more variables how much pure acid should be mixed with 2 gallons of a 40% acid solution in order to get a 70% acid solution. Can you please show the formula for mixture problems. thank you.