book Maths Puzzle Numerical Ability

A woman and her grandson have the same birthday. For six consecutive birthdays,
she is an integral multiple of his age. How old is the grandmother at the sixth of these birthdays?

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book Other Question

Factor each polynomial completely

x^3y + 2x^2y^2 + xy^2

Is the common factor X^3 ? I am haveing a problem with figureing out the CF In an election poll, 56% of 400 voters chose a certain canditate. Find the margin of sampling error.