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joel3410
17.01.2020 •
Mathematics
This question: 2 pts
20 of 40 (19 complete)
this test: 80 pts
a bank teller has some five-dollar bills and some twenty-dollar bills. the teller has 10 more of the twenties. the total value of the money is $675 find the number of five-dollar bills that the teller has
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Ответ:
19 five dollar bills
Step-by-step explanation:
x = $5 bills and y = $20 bills
5x + 20y = 675
y = x + 10
now we sub
5x + 20(x + 10) = 675
5x + 20x + 200 = 675
5x + 20x = 675 - 200
25x = 475
x = 475/25
x = 19 <===
y = x + 10
y = 19 + 10
y = 29
lets check it..
5x + 20y = 675
5(19) + 20(29) = 675
95 + 580 = 675
675 = 675 (correct)...so it checks out
the bank teller has 19 five dollar bills <===
Ответ: