exam Maths Puzzle Numerical Ability

Please help me with this problem:
The sum of three numbers is 14. The largest is 4 times the smallest, while the sum of the smallest and twice the largest is 18. Use a linear system in three variables to find the three number.

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exam Other Question
How do I find the final answer
4.10*10-4 = 2x/(.15-x)(.30-x) please help me to solve this word problem: if x is the first of four consecutive even integers, write their sum as an algebraic expression in x.