book Maths Puzzle Numerical Ability

List all the prime numbers between 45 and 80.

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book Other Question

Word problem help: Five bells begin to toll together and then at intervals of 3,5,7,8 and 10 seconds respectively. Find after what interval they will again toll together ?? add or subtract, simplify if possible and show steps to answer

x-4/x-3 + x-1/3-x