Question 941084
x the number of 50¢ coins. Then...{{{12-x}}} the number of 10¢ coins
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50x + 10(12-x) = 240¢  (CENTS makes Sense)
x = 120/40 = 3, the number of 50¢ coins.  And 9 10¢ coins. {{{12-3}}}
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And...checking
150 + 90 = 240¢  0r $2.40