SOLUTION: Ten 6.0-V and 12-V batteries have a total voltage of 84 V. How many of each type are there?

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Question 159675: Ten 6.0-V and 12-V batteries have a total voltage of 84 V. How many of each type are there?
Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
S+T=10 OR S=10-T
6(10-T)+10T=84
60-6T+10T=84
4T=84-60
4T=24
T=24/4
T=6 IS THE NUMBER OF 10 VOLT BATTERIES.
S+6=10
S=10-6
S=4 6 VOLT BATTERIES.
pROOF:
6*4+10*6=84
24+60=84
84=84