exam Maths Puzzle Numerical Ability

The second of three numbers is 1 less than the first. The third number is 5 less than the second. If the first number is twice as large as the third, Find the three numbers.

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Please someone help...I've been trying to figure where I'm going wrong....I get almost to the end and my last fraction is always wrong...so I'm not multiping somewhere right.... how do you simplify 4(3 x 10^5) then write it in scientific notation?