exam Maths Puzzle Numerical Ability

lorenzo bought several pounds of chocolate-covered peanuts and gave the cashier a $20 bill. Write and expression for the amount of change he will recive if p represents the costs of the peanuts.

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exam Other Question

A water storage tank is shaped like a circular cylinder with half of a sphere at each end.Find the volume of the tank if the cylindrical section is 100 cm long with a 40cm diameter.Use 3.14 for pi.Round the final answer to two decimal places. Tom can do a job in 3 hours, Dick in 4 hours, and Harry in 6 hours. If they do it together (and do not delay each other), how long does the job take?