book Maths Puzzle Numerical Ability

Find the three concecutive even integers for which 3 times the largest is twice the sum of the two smallest integers. This question has me stumped, would someone help me figure it out?

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book Other Question

Members of a marching band are making there own color-guard flags. Each flag is 1.2 yards by 0.5 yard. The material costs $1.75 per square yard. How can i write a function showing verify the given identy

cos^2B-sin^2B=2cos^2B-a