Multiple choice

Two tanks X and Y are filled to capacity with jet fuel. Tank X holds 600 gallons more than tank Y. If 100 gallons of fuel were to be pumped from each tank, tank X would then contain 3 times as much fuel as tank Y. What is the total amount of fuel in two full tanks (in gallons)?

  1. 1,400

  2. 1,200

  3. 1,000

  4. 900

  5. 800
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A Correct answer
Explanation

If the capacities of the two tanks are x and y respectively, it is given x = y + 600, and (x -100) = 3(y - 100). Substituting the value of x in the second equation, we get y + 500 = 3y - 300. So, 2y = 800, or y = 400. So, x = 1000. So, the total number of gallons in two full tanks = 1400.

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