4 years ago

Find the missing number ___:7 = 12:21a.14b.12c.4d.3

1 answer:

6 0

$x:7=12:21\to\dfrac{x}{7}=\dfrac{12}{21}\ \ \ |cross\ multiply\\\\21x=7\cdot12\\21x=84\ \ \ |divide\ both\ sides\ by\ 21\\\boxed{x=4}\\\\Other\ method:\\\dfrac{x}{7}=\dfrac{12}{21}\\\\21:7=\boxed3\to12:\boxed3=4\\\\\boxed{\frac{4}{7}=\frac{12}{21}\to4:7=12:21}$

You might be interested in

What is the nth term of the linear sequence shown below? -9, -5, -1, 3, 7.

frutty [35]

Answer:

4n - 13

Step-by-step explanation:

There's a +4 between each number in the sequence.

4n

The previous number before the first given (-9) is -13.

4n - 13

6 0

3 years ago

A fruit production company has three packaging facilities, each of which uses different-sized boxes as follows: 36 pieces/box, 1

Gekata [30.6K]

Answer:

hmmmmmm

Step-by-step explanation:

hmmmmmmmmmmmmm

5 0

3 years ago

Once again the help will be greatly appreciated

Umnica [9.8K]

Answer:

Step-by-step explanation:

because all of that equals 1 hope it helps

3 0

3 years ago

Choose the expression that represents “three less than seven times a number.

olga nikolaevna [1]

7x-3 should be the answer

6 0

3 years ago

Read 2 more answers

What is the area of the trapezoid?<br>

givi [52]

Answer:100 m^2

Step-by-step explanation:

Area of trapezoid is shown in the equation

Area = (a x b)/ h where a and b are the bases of the trapezoid and h is the height.

In this problem, a = 8, b=12, and h=10 so area is calculated to be:

A=(8x12)/10 = 100

3 0

3 years ago