book Maths Puzzle Numerical Ability

determine the probability of getting a zero heads when tossing a coin four times.

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Milo sees a sign that describes the distance to Digitopolis in six different ways. according to this sign how many inches are in a rod? please help me with this problem i think it's correct but not sure 1/2(550+x)/20=25 2/1x25/1=2/1x1/2(550+x)/20 50=550+x/20 20/1x50/1=550+x/20x20/1 1000=55