exam Maths Puzzle Numerical Ability

The length of a pool is 3 times its width, and the pool is surrounded by a grass walk 4 feet wide. If the total area enclosed by the walk (of uniform width) is 684 square feet, find the dimensions of the pool.

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One number is 7 less than a second number. Twice the second number is 50 more than 5 times the first. Find the two numbers.
Word Problem:
Janice has enough money to purchase pebbles to cover 74 square feet. She wishes to form a border around her pool. The pool measures 25 ft. in length and 10 ft in width. How wide should she make the border