exam Maths Puzzle Numerical Ability

The sum of 5 times a number and 7/8 is equal to the difference between six times a number and 1/4. Find the number

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evaluate 4 to the 2nd power + 2 times 7 - (5 times 4 -15) THis is the best way I can type it. Thanks A 40% antifreeze solution and a 70% antifreeze solution is mixed to make 12 gallons of 50% antifrezze solution. How many gallons of each antifreeze solution should be used.