book Maths Puzzle Numerical Ability

Solving equations by using models please help
m - 6 = -8

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Find the amount of alcohol in liters in 300 liters of 22 percent alcohol solution. Attach the unit L for liter after your answer. Susan wants to have business cards printed. One style will cost $25 plus 2 cents per card. Another style will cost $10 plus 5 cents per card. For how many cards will the cost be th