book Maths Puzzle Numerical Ability

can you please help me to understand how to solve problems such as this one below:
-18=m/6

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book Other Question

A retailer spent $48 to purchase a number of special mugs. Two of them were broken in the store,but by selling each of the remaining mugs for $3 above the original cost per mug, sh One crew can put up holiday decorations in the mall in 9 hours. A second crew can put up the decorations in 7 hours. How long will it take if both crews work together to decorate the mall? Please enter your answer as a number without the units.