7:

The mean of six numbers is 25.

Three of the numbers are 15,15 and 30.

The second unknown number is twice the first unknown number, and third unknown number is twice the sum of the first two unknown numbers.

Find the unknown numbers.

Select all that apply.

A

12

B

10

C

60

D

25

E

20

F

30

G

5

Question

Laurel Knapp

Mathematics

30 December, 02:19

7:

The mean of six numbers is 25.

Three of the numbers are 15,15 and 30.

The second unknown number is twice the first unknown number, and third unknown number is twice the sum of the first two unknown numbers.

Find the unknown numbers.

Select all that apply.

A

12

B

10

C

60

D

25

E

20

F

30

G

5

+1

Answers (1)

Know the Answer?

Addyson Lang · Answer 1

(B) (C) (E)

Step-by-step explanation:

15, 15, 30 = 60

The 3 numbers sum is equal to 90

first number uknown = x

seconds unknown number = y

third unkown number = z

2x = y

2x + 2y = z

2x + 2 (2x) = z

2x + 4x = z

6x = z

x + 2x + 6x = 90

9x = 90

* = 10

2 * = y

20 = y

6x = y

60 = y

10, 20, 60

7:The mean of six numbers is 25. Three of the numbers are 15,15 and 30. The second unknown number is twice the first unknown number, and third unknown number is twice the sum of the first two unknown numbers. Find the unknown numbers. Select all that apply.A12B10C60D25E20F30G5