3 years ago

Please answer this question

Mathematics

1 answer:

Gnesinka [82]3 years ago

3 0

Answer:

There are 20 kids total in the class.

Step-by-step explanation:

15/100 × 20 = 3

You can use direct proportion for any percent calculation.

Compare each number with its percent.

3 i s 15 % of what number? Let the number be x

So, 3 represents 15 % and x represents 100 %

x/ 100 = 3/15

Multiply by 100 to isolate x

x = $\frac{3 x 100}{15}$

x = 20

Check: 15/ 100 × 20 = 3

You might be interested in

Can someone help me with this exercise

Solnce55 [7]

Answer:

Step-by-step explanation:

6 0

3 years ago

Ling must spend no more than $40.00 on decorations for a party. She has spent $10.00 on streamers and wants to buy bags of ballo

Mumz [18]

A, She can buy from 0 to 12 bags, but no more.

4 0

3 years ago

ZABD and DBC are supplementary angles

Levart [38]

Answer:

Step-by-step explanation:

5 0

3 years ago

Read 2 more answers

A circle is defined by the equation x2 + y2 + 8x + 22y + 37 = 0. What are the coordinates for the center of the circle and the l

inn [45]

We can say that:
8x = -2ax
8 = -2a
a = -4

22y = - 2by
22 = -2b
b = -11

37 = a² + b² - r²
37 = (-4)² + (-11)² - r²
r² = 16 + 121 - 37
r² = 100
r = 10

With all this information, we can say that:
The center of the circle is: (-4 ; -11)
and the radius of the circle is r = 10

P.S:
(a - x)² + (b-y)² = r²
a² - 2ax + x² + b² -2by + y² - r² = 0
x² + y² -2ax - 2by + a² + b² - r² = 0

6 0

3 years ago

A survey in one middle school showed that 4 out of 9 students help cook meals at home. Predict how many out of the 720 students

valentinak56 [21]

Answer:

yes b

Step-by-step explanation:

yes

5 0

3 years ago