All categories

3 years ago

Fred washes a car in 6 minutes, Carl washes a car in 8 minutes. If they wash a car together then how long will it take?

Mathematics

2 answers:

kondor19780726 [428]3 years ago

8 0

Based on the problem Carl will complete...

1/6 of the job per minute.

Fred will complete 1/8 of the job per minute.

Together they will complete... 1/6+1/8 of the job per minute.

That would be 7/24.

How long will that take?

1/(7/24)=24/7=3 3/7

It will take 3 and 3/7 minutes to finish washing the car.

Ksju [112]3 years ago

6 0

Answer:

3.5 minutes.

Step-by-step explanation:

If Fred can wash 1/6 of a car in 1 minute and Carl can was 1/8 of a car in a minute as well then together in 1 minute it would be:

= 1/6 + 1/8

= 4/24 + 3/24

= 7/24

= $3\frac{3}{7\\}$

= 3.429

So we have:

≈ 3.5 min

I hope this helps!

You might be interested in

Please help me answer this:) Will give you brainlst ^

Step2247 [10]

Answer:

youths print: 34

youths electronic: 39

youths total: 73

adults print: 22

adults electronic: 35

adults total:57

total print: 56

total electronic: 74

total total: 130

3 0

3 years ago

Almost done~! ❤️❤️❤️❤️❤️❤️❤️❤️✨✨✨✨✨✨✨✨✨✨

Llana [10]

Answer:

Step-by-step explanation:

Hope this helps!

7 0

3 years ago

Adding a few more points to this one plz answer the question in the picture

Ne4ueva [31]

Answer:

The greatest number of arrangements possible would be 5

Step-by-step explanation:

If we look at the x values (in this case # of tulips remaining) we can find the number 20. And we see that there is a line going through it. We then stop at the point and go down to see what number it would fall on on the y axis.

3 0

3 years ago

Read 2 more answers

Can someone answer this for me just tell me what to pick

Marizza181 [45]

The inequality you require is

The number of bottles left at the end of each day is 48 - 3x. So it is:-

48 - 3x < 10

Solving the inequality to find the last part of question:-

-3x < 10 - 48

-3x < -38

x > 38/3 = 12 2/3

So answer is 13 days.

3 0

3 years ago

Use algebra to solve 3x+4 = 1/x The exact solutions are x= Х

skad [1K]

Answer:

Ignore the A before the ±, it wouldn't let me type it correctly.

$x=\frac{2±\sqrt{7} }{3}$

Step-by-step explanation:

3x + 4 = 1 ÷ x

3x + 4 - 4 = 1 ÷ x - 4

3x = 1 ÷ x - 4

$3x=\frac{1}{x} +\frac{x(-4)}{x}$

$3x=\frac{1+x(-4)}{x}$

$3x=\frac{1-4x}{x}$

$x(3x)=x(\frac{1-4x}{x})$

x · 3x = - 4x + 1

3x² = - 4x + 1

3x² - (- 4x + 1) = 0

3x² + 4x - 1 = 0

Ignore the A before the ±, it wouldn't let me type it correctly.

$x=\frac{-b±\sqrt{b^{2}-4ac } }{2a}$

a = 3

b = 4

c = - 1

$x=\frac{-4±\sqrt{4^{2}-4((3)(-1)) } }{2(3)}$

$x=\frac{-4±\sqrt{16-4((3)(-1)) } }{2(3)}$

$x=\frac{-4±\sqrt{16+12 } }{2(3)}$

$x=\frac{-4±\sqrt{28 } }{2(3)}$

$x=\frac{-4±\sqrt{(2)(14) } }{2(3)}$

$x=\frac{-4±\sqrt{(2)(2)(7) } }{2(3)}$

$x=\frac{-4±\sqrt{2 } \sqrt{2}\sqrt{7} }{2(3)}$

$x=\frac{-4±2\sqrt{7} }{2(3)}$

$x=\frac{-4±2\sqrt{7} }{6}$

Two separate equations

$x=\frac{-4+2\sqrt{7} }{6}$

$x=\frac{2+\sqrt{7} }{3}$

$x=\frac{-4-2\sqrt{7} }{6}$

$x=\frac{2-\sqrt{7} }{3}$

7 0

3 years ago