Suppose:
C=cost
c=cost per kilo-watt hour
w=number of watts
h=number of hours
thus
C=kwhc
where:
k=constant of proportionality:
k=C/(whc)
but
C=15 when w=6000, h=10/60=1/6 hours, c=7.5 cents per kw/h
thus
k=15/(6000*1/6*7.5)
k=0.002
thus:
C=0.002(whc)
hence:
when
h=70*2=140=140/6=70/3 hours the cost will be:
C=0.002(6000*70/3*7.5)
C=2100 cents
C=$21
Do you need help with all of these?
Answer:
option 2
Step-by-step explanation:
128/100=32/25
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Answer:
I'm not sure if your question was to find the number of girls, but if it was, here's the answer
Step-by-step explanation:
Total number of students= 572
number of boys= 5
So, number of girls= 572-5 =567 (ans)
