Question 1072144
A cashier has a total of 94 bills, made up of tens and twenties. The total value of the money is $1340. How much of each kind does have?
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Let  t=number of tens
      v=number of twenties

t+v = 94 (1)
10t + 20v = 1340 (2)

multiply (1) by 10:
10t + 10v = 940
subtract this from (2):
  10t + 20v = 1340 
 -(10t +10v = 940 )
           10v = 400

v = 400/10 = 40  —>  t = 94-40 = 54

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 Ans:  The cashier has 54 tens and 40 twenties
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Check:   54*10 + 40*20 = 540 + 800 = 1340