book Maths Puzzle Numerical Ability

Find four consecutive odd integers such that the sum of the second and third is 48 less than the sum of all four integers.

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book Other Question

A electronics store wants to order at least 3 times as many DVD players as VHS players. Write an inequality expressing this relationship. please help me with {9x-y-2z=18
5x-2y+z=10
4x+y-3z=8