exam Maths Puzzle Numerical Ability

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.

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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. With a certain tail wind a jet air craft arrives at its destination 1,890 miles away in 3 hours. Flying against the same wind, the plane makes the return trip in 3 3/8 hours. Find the windspeed and airspeed.