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# How many marbles does Kevin have? (1) If Kevin had 10 fewer marbles

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Math Expert
Joined: 02 Sep 2009
Posts: 58454
How many marbles does Kevin have? (1) If Kevin had 10 fewer marbles  [#permalink]

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29 Oct 2018, 04:57
00:00

Difficulty:

15% (low)

Question Stats:

91% (00:44) correct 9% (01:13) wrong based on 24 sessions

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How many marbles does Kevin have?

(1) If Kevin had 10 fewer marbles, he would have only half as many marbles as he actually has.
(2) Kevin has thrice as many black marbles as white marbles.

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Re: How many marbles does Kevin have? (1) If Kevin had 10 fewer marbles  [#permalink]

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29 Oct 2018, 05:14
From statement 1:

Let Kevin have X marbles.
Then X-10 = X/2
Solving gives X = 20.
Sufficient.

From statement 2:

Total Marbles = White+3Black.
Clearly insufficient.

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Re: How many marbles does Kevin have? (1) If Kevin had 10 fewer marbles   [#permalink] 29 Oct 2018, 05:14
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