exam Maths Puzzle Numerical Ability

Six coins are tossed; in how many ways can you have: at least two heads?

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"Prove that if n is an integer and log2 is rational, then log2 n is an integer?"
Alonzo can travel from his camp downstream to the mouth of the river in 30 minutes. If it takes him 45 minutes to come back, then how long would it take him to go that same distanc