book Maths Puzzle Numerical Ability

A plane flies 700 miles against a steady 20-mi/h headwind and then returns, with the wind, to the same point. If the entire trip took 12 hours, what was the speed of the plane in

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book Other Question
Write the following expression using positive exponents and simplify when possible.

-x^-4 You have $24.05 with 210 coins in quarters, nickels and dimes, such that twice the number of quarters is 13 more than the number of nickels. find how many of each coin you have.