A store received $823 from the sale of 5 tape recorders and 7 radios. If the receipts from the tape recorders exceeded the receipts from the radios by $137, what was the cost of a tape recorder?
$49
$68
$84
$96

Question

A store received $823 from the sale of 5 tape recorders and 7 radios.  If the receipts from the tape recorders exceeded the receipts from the radios by $137, what was the cost of a tape recorder?  
    $49  
   $68  
   $84  
   $96

owlfred · Answer

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anonymous · Answer

So:
x - price of all radios
x+137 - price of all tape recorders
than:
x+137+x=823
2x=686
x=343 => price of 7 radios = 343 => price of 5 tape recorders = 823-343 = 480
than 1 tape recorder's price is 480/5 = 96.
I think this way:)

anonymous · Answer

TAPE RECORDER=TP
RADIO=R

5TP+7R=823
5TP-7R=137

10TP= 960
TP=960/10=96