A window washer cleaned 28 windows in 4 hours. At this rate, how many windows did he clean in 9 hours?
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Answer:
Given:-
The length of copper wire (L) = 270 cm
Area of cross-sectional (A) = 0.030
and specific resistance (ρ) = ohm-cm.
Use the formula R=(Specific resistance*L)/A, to calculate the Resistance(R)
then, ohm
Simplify:
R = 0.0162 ohm = ohm
Therefore, the resistance of copper wire is, Ω
Let x be the number of weeks; therefore, the two linear equations are
Where T stands for the punches on the tea punch card and C for the punches on the coffee punch card.
Solving by substitution. Set T=C, then
Thus, substitute the value of x=3 into the first equation,
Thus, after 3 weeks, Josiah will have the same number of punches on each card, and he will have 23 punches on each card.