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3 years ago

40% of a number is 68.What is the number?

Mathematics

1 answer:

Talja [164]3 years ago

7 0

The number is 17 hope it helps

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If i hace 2 f's and i am homeschooled will i get held back and repeat the 7th grade?

KonstantinChe [14]

You would probably have to repeat the 7th grade, because you need to have a certain GPA, and 2 F's mean that you are only able to get 2.0 GPA, maximum. Otherwise, you'll fail. So, you have a very small chance of passing.

8 0

3 years ago

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Two cyclists, Alan and Brian, are racing around oval track of length 450m on the same direction simultaneously from the same poi

skelet666 [1.2K]

Answer:

Alan: 200 m/min

Brian: 150 m/min

Step-by-step explanation:

Given : Two cyclists, Alan and Brian, are racing around oval track of length 450m on the same direction simultaneously from the same point. Alan races around the track in 45 seconds before Brian does and overtakes him every 9 minutes.

To find : What are their rates, in meters per minute?

Solution :

Let n represent the number of laps that Alan completes in 9 minutes.

Then n-1 is the number of laps Brian completes.

45 seconds = 3/4 minutes.

The difference in their lap times in minutes per lap is

$\frac{9}{(n -1)}-\frac{9}{n} =\frac{3}{4}$

Solving the equation we get,

$\frac{9n-9n+9}{n(n -1)} =\frac{3}{4}$

$9\times 4=3\times n(n -1)$

$36=3\times n(n -1)$

$n^2-n-12=0$

$n^2-4n+3n-12=0$

$n(n-4)+3(n-4)=0$

$(n-4)(n+3)=0$

$n=4,-3$

Neglecting n=-3

So, n=4

Then Alan's speed in m/min is

$S=\frac{D}{T}$

$S_a=\frac{4\times 450}{9}$

$S_a=200 m/min$

Brian completes 3 laps in that 9-minute time, so his rate is

$S_b=\frac{3\times 450}{9}$

$S_b=150 m/min$

Therefore, Alan: 200 m/min

Brian: 150 m/min

4 0

3 years ago

The adult elephant at the zoo weighs 12,500 pounds. It is five times heavier than the baby elephant. How much does the baby elep

Sveta_85 [38]

Adult weighs 12,500 pounds
it is 5 times heavier
baby = x

adult = 5x ( 5 times the weight of the baby)

12,500 = 5x

divide both sides by 5

x = 12500 / 5
x = 2500
the baby weights 2,500 pounds

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3 years ago

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The ratio of SAMs age to hank is 5 to 3. If the sum of their age is 24. How old is is hank?

Serggg [28]

Lets consider SAM's age is 'x' and Hank's age is 'y'
So as per given data Sam's age is 5/3 times of Hank's age
so x = 5/3 * y
3x = 5y --> equation 1
and also sum of their ages is 24
so, x + y = 24
we need to find Hank's age (y)
so x = 24 - y
Now replace x value in equation 1
3(24-y) = 5y
72-3y = 5y
72 = 3y+5y
8y= 72
y= 72/8
y = 9 years.

So the Hank's age is 9 years

.

3 0

3 years ago

Can someone help me?It's urgent and thank you!

Dafna1 [17]

Answer number 3

Step-by-step explanation:

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3 years ago

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