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A store sells batteries in packets of 6 or 10. It has a stock of 25 packets containing a total of 186 batteries. How many of these are 10-battery packets?

Precalculus
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So suppose you have x packets of 6 and y packets of 10. The total number of batteries would be: 6*x + 10*y = 186
In total, you have 25 packets, so the sum of all the packets containing 6 and 10 batteries is: x+y=25
And we don't usually write the asterisk (*) if it's not necessary, so it'd be 6x+10y=186

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Other answers:

Solve the system: 6x+10y=186 x+y=25 y will be the number of 10-battery packets

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