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3 years ago

What percent of 60 is 15

1 answer:

8 0

Percent formula : is/of = %/100

what percent of 60 is 15....
is = 15
of = 60
% = x
now we sub
15/60 = x/100
cross multiply
(60)(x) = (15)(100)
60x = 1500
x = 1500/60
x = 25

so 25% of 60 is 15

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A truck driver travels at 59 miles per hour. The truck tires have a diameter of 30 inches. What is the angular velocity of the w

Misha Larkins [42]

Answer:

$661.4\ rpm$

Step-by-step explanation:

we know that

1 mile=63,360 inches

step 1

Find the circumference of the wheels

$C=2\pi r$

we have

$r=30/2=15\ in$ -----> the radius is half the diameter

substitute

$C=2\pi(15)$

$C=30\pi\ in$

assume

$\pi =3.14$

$C=30(3.14)=94.2\ in$

Remember that

The circumference of the wheels represent one revolution

Convert 59 miles per hour to inches per minute

$59\ mi/h=59*63,360/60=62,304\ in/min$

using proportion find the number of revolutions

$\frac{1}{94.2}\frac{rev}{in}=\frac{x}{62,304}\frac{rev}{in}\\ \\x=62,304/94.2\\ \\x=661.4\ rev$

therefore

substitute

$62,304\ in/min=661.4\ rev/min=661.4\ rpm$

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2 years ago

Are the decimals 0.4 and 0.40 equal?

zepelin [54]

0.4 and 0.40 are equal. That zero on the hundredths place does not matter.

3 0

3 years ago

Read 2 more answers

Solve the equation showing each inverse operation step:

valina [46]

Answer:

4 2/7 - 6/7 = 24/

= 3 3/

Step-by-step explanation:

Conversion a mixed number 4 2/

to a improper fraction: 4 2/7 = 4 2/

= 4 · 7 + 2/

= 28 + 2/

= 30/

To find a new numerator:

a) Multiply the whole number 4 by the denominator 7. Whole number 4 equally 4 * 7/

= 28/

b) Add the answer from previous step 28 to the numerator 2. New numerator is 28 + 2 = 30

c) Write a previous answer (new numerator 30) over the denominator 7.

Four and two sevenths is thirty sevenths

Subtract: 30/

- 6/

= 30 - 6/

= 24/

For adding, subtracting, and comparing fractions, it is suitable to adjust both fractions to a common (equal, identical) denominator. The common denominator you can calculate as the least common multiple of both denominators - LCM(7, 7) = 7. In practice, it is enough to find the common denominator (not necessarily the lowest) by multiplying the denominators: 7 × 7 = 49. In the following intermediate step, it cannot further simplify the fraction result by canceling.

In other words - thirty sevenths minus six sevenths = twenty-four sevenths.

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