book Maths Puzzle Numerical Ability

(5m+5)=7-2m
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4

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book Other Question

Ponder the structur of this summation and then enter the alebraic express that defines f(n)=???? as a function of n.

In a story of the invenotr of the game of chess was asked by 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?