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lmolmlm5420
26.03.2020 •
Mathematics
Bill has 38 bills. He he has ten dollar bills and five dollar bills only. If he has $260, how many five dollar bills does he have?
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Ответ:
20 five dollar bills
Step-by-step explanation:
let x be the 5 dollar bills and y the 10 dollar bills,
5x+10y=260 --> divide both sides by 5 --> x+2y=52
x+y=36
x=36-y
substitute x into the first equation,
(36-y)+2y=52
36-y+2y=52
36+y=52
y=52-36
y=16
substitute y into the second equation,
x=36-(16)
x=20
Ответ:
Let v = number of video's she bought
Let c = number of CD's she bought
v+c=16
1495v+1688c=9355
Multiply both sides of (1) by 1495
and subtract (1) from (2)
-1495v-1495c=-8970
193c=386
c=2h