exam Maths Puzzle Numerical Ability

Torry took 6 tests, she had an average 97. First 5 tests had the same score. The last test had 12 points less. What was her last test score?

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Can you help me solve the equation for x
5-3(2x-7)=8-4x Profit: A small appliance manufacturer finds that the profit P (in dollars) generated by producing x microwave ovens per week is given by the formula
P=1/10(x)(300-x) provided th