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3 years ago

Help on image!! it 10 point

Mathematics

1 answer:

STatiana [176]3 years ago

7 0

5% * x = 30

5% of the total kids own bird. 30 kids own birds.

We need to find out how many people there are in total.

5% * x = 30
5/100 * x = 30
1/20 * x = 30
x = 30 * 20
x = 600

There were a total of 600 sixth graders surveyed.

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Steve noticed that there were 72 lights on and 78 lights turned off.

Oliga [24]

Answer:

49% of the lights are on!

7 0

3 years ago

If a is an odd number, b is not divisible by 3 and LCM of a and b is P, what is the LCM of 3a and 2b?

Olenka [21]

Answer:

The LCM of 3a and 2b = 6P

Step-by-step explanation:

LCM of 3 a and 2 b will be 6 p

Since a is odd, which means it's not divisible by 2. Therefore a can be number 1, 3, 5, 7, 9, 11, .......

b is not divisible by 3, which means b can be number 1, 2, 4, 5, 7, 8, 10, 11, .....

LCM of a and b is P

Factors of 2b can be 2 multiplied by (1, 2, 4, 5, 7, 8, 10, 11, ..... )

Factors of 3a can be 3 multiplied by (1, 3, 5, 7, 9, 11, .......)

So, to get the LCM of 3a and 2b, since we already show the factors of a and b, Then, 3 X 2 X P (remember P is the LCM of a and b)

The LCM of 3a and 2b = 6P

3 0

4 years ago

What is the value of x?<br> Enter your answer in the box.<br> x =

Svetllana [295]

Answer:

Step-by-step explanation:

The two triangles are similar and therefore we can set up a proportion

9/(9 + 72) = (3x - 20)/(3x - 20 + 56) Combine like terms on the right

9/(81) = (3x - 20)/(3x + 36) Cross multiply

9(3x + 36) = 81 (3x - 20) Remove the brackets.

27x + 324 +1620 = 243x Add 1620 to both sides

27x + 324 + 1620 = 243x Subtract 27x from both

1944 = 216x divide both sides by 216

x = 9

If you feel comfortable canceling the size of the numbers can be reduced.

9/81 = 1/9

1/9 = (3x - 20)/(3x + 36)

3x + 36 = 9(3x - 20)

3x + 36 = 27x - 180

36 + 180 = 24x

216 = 24x

216/24 = x

x = 9

There is another cancelation possible, but this is simple enough.

6 0

3 years ago

Bus A and Bus B leave the bus depot at 5 pm.

professor190 [17]

11:00 P.M.
Bus A would do the route 13 times
Bus B would do the route 12 times

4 0

3 years ago

In a bouquet of 24 roses, sixteen are red and the rest are pink. What is the ratio of pink to red roses?

irina1246 [14]

Answer: 1:2 ratio

Step-by-step explanation:

Total-red roses=pink roses

24-16=8

8:16

GCF: 8

16/8=2

8/8=1

1:2 ratio

pink:red

7 0

3 years ago

Read 2 more answers