exam Maths Puzzle Numerical Ability

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4.10*10-4 = 2x/(.15-x)(.30-x)

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exam Other Question

In the design of a bridge, an engineer determines that four fewer 18-m girders are needed for the span length than 15-m girders. How many 18-m girders are needed? 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.