Question

The average of three Numbers is 5 if the sum of the frist two numbers is 6 then the third number

Answer 1

ᴀɴsᴡᴇʀ :-

ʟᴇᴛ 1sᴛ ɴᴜᴍʙᴇʀ ʙᴇ "ᴀ"

2ɴᴅ ɴᴏᴜᴍʙᴇʀ ʙᴇ "ʙ"

3ʀᴅ ɴᴜᴍʙᴇʀ ʙᴇ "ᴄ"

ᴀᴄᴄᴏʀᴅɪɴɢ ᴛᴏ ᴛʜᴇ ǫᴜᴇsᴛɪᴏɴ :-

ᴀ + ʙ + ᴄ / 3 = 5

ᴀ + ʙ + ᴄ = 15 ..(1 ᴇǫ)

ɢɪᴠᴇɴ :-

ᴀ + ʙ = 6 ..(2 ᴇǫ)

ʙʏ ᴇǫ 1 ᴀɴᴅ 2

6 + ᴄ = 15

ᴄ= 9

____________________

Answer 2

Answer:

9 is the third number

Step-by-step explanation:

FIRSTLY;

Let your all three numbers be represented by a variable.

SO; let's use x

because it is 3 numbers, we will have x + x + x

given 3x.

BUT;

sum of first two numbers is 6;

hence; x + x = 6

Since we know the first two numbers we will go

ahead calculating for the third number .

REMEMBER;

The third number is also represented by the identical variable ( x )

Also;

working with average or mean you must count the number of numbers given and divide it by your result. Example; 2+3+4 will be divided by 3 since when counting your numbers you will get 3 numbers all together

FURTHERMORE:

;

Our third number is

sum of first two numbers + x(the variable)/3

Now;

we have been given our result as 5 .So; just equate your equation to 5

thus; 6+x/3 = 5

L.C.M= 3

3× 6 + x/3 = 5 × 3

6 + x = 15

GROUPING LIKED TERMS

x = 9

Hence your third number represented by the variable x is 9.