Diana had a large stack of playing cards. she knew that 17 of them were kings. she took a sample of 30 cards and found 4 kings. Approximately how many playing cards did Diana have?
If we assume the kings are distributed evenly throughout the cards, we can use a ratio to compare:
out of 30 cards there are 4 kings, x cards have 17 kings
30/4 = x/17
4x = 510
there are approximately 128 cards
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