Question 202088
There are exactly four times as many submarines as there are aircraft. Which of the following can be the total number of submarines and aircraft combined?
1. 35
2. 63
3. 39
4. 41 
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Let the number of aircraft be "x".
Then the number of subs is "4x".
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Equation: x + 4x = 5x
So the total number of subs and aircraft must be a multiple of 5.
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Answer: 35
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Cheers,
Stan H.