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kimlyn58p0wyn0
22.07.2019 •
Mathematics
Jessica has $7 left in her pocket. she spent $6 on a ticket to a baseball game, $3 on a hot dog, and $9 on a hat. how much money did she have at the beginning of the day?
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Ответ:
Ответ:
1)
100=20*5999=199*5+4Number of multiple of 5 =(199-20+1)=180
2)100=15*7-5999=142*7+5Number of multiple of 7= 142-15+1=128
3)5*7=35100=3*35-5999=28*35+19Number of multiple of (5 and 7) =28-3+1=26
4) Number of three-digit numbers= 999-100+1=900
5)Number of three-digit numbers are multiples of neither 5 nor 7=900-(128+180-26)=618
Proof :This programm in QB64 print nb=618.
' How many three-digit numbers are multiples of neither 5 nor 7?
DIM i AS INTEGER, nb AS INTEGER
nb = 0
FOR i = 100 TO 999
IF i MOD 5 = 0 OR i MOD 7 = 0 THEN
ELSE
nb = nb + 1
PRINT nb; i
END IF
NEXT i
PRINT "nb="; nb
END