Answer:
20 hours
Step-by-step explanation:
We can work easier if we think in terms of an hour
the first equation that we can write is
A + B = 1/4 (its meaning is that in an hour A and B fill 1/4 of the cistern)
the second equation we can write is
A + C = 1/5 (its meaning is that in an hour A and C fill 1/5 of the cistern)
the third equation that we can write is
B = 2C (its meaning is that in an hour B fill 2 times C the cistern)
now we can substitute the value of B in the first two equations
A + 2C = 1/4
A + C = 1/5
A = 1/5 - C
1/5 - C + 2C = 1/4
C = 1/4 -1/5
C = (5-4)/20
C = 1/20 (this means that in an hour C will fill 1/20 of the cistern, so it takes 20 hours to fill the entire cistern)
A = 1/5 - 1/20
A = (4-1)/20 = 3/20
B = 1/20 *2 = 1/10
2450 miles / 35 inches = 70 miles / inch
(big freaking map!)
Area= Length*width
38.25m^2=Length*4.5m
38.25m^2/4.5m=Length=8.5m
Any questions feel free to ask. Thank you
Answer:
A number line going from 0 to 10. An open circle is at 7. Everything to the left of the circle is shaded.
Step-by-step explanation:
We have the following inequality:
-1.1x + 6.4 > -1.3
to solve it, we need to isolate x, as follows:
-1.1x > -1.3 - 6.4
-1.1x > -7.7
x < -7.7/-1.1 (notice that while dividing with a negative number, the sign changes)
x < 7
