Question 13052
there are 5 times as many blue topaz gems as citrine gems;
2 times as many rubies as citrine gems;and
48 gems in all 
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Let the number of citrine gems be "x".
number of rubies is "2x"
number of topaz is "5x"
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EQUATION:
x + 2x + 5x = 48
8x = 48
x = 6
# of citrine = 6
# of rubies = 12
# of topaz = 30
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Cheers,
Stan H.