book Maths Puzzle Numerical Ability

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0.8%=?

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Nathan ate 250 hot dogs in 10 days as part of a conteat. If he ate 2 more on day 1 and kept the pattern going, how many did Nathan eat on day 10? construct a 3x3 non zero matrix A such that the vector [1 -2 1] (vertical column not horizontal) is a solution of Ax=0