Book Maths Puzzle Algebra

Three times the larger of two numbers is equal to four times the smaller.the sum of the numbers is 21. please help me find the numbers.

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Book Other Question

A room is 16ft long, 14ft wide and 8ft high. How many cubic feet of air does the room contain? If the sides of a triangle measure 8,9,and 10,find the longest side of a similar triangle whose perimeter is 81.