Posted by MNHS on Wednesday, November 14, 2012 at 2:10am.
( a1 + a2 + a3 + a4 + a5 + a6 + a7 + a8 + a9 + a10 ) / 10 = 12 Multiply both sides by 10
a1 + a2 + a3 + a4 + a5 + a6 + a7 + a8 + a9 + a10 = 120
( a1 + a2 + a3 + a4 + a5 + a6 + a7 + a8 + a9 ) / 9 = 11 Multiply both sides by 9
a1 + a2 + a3 + a4 + a5 + a6 + a7 + a8 + a9 = 99
( a1 + a2 + a3 + a4 + a5 + a6 + a7 + a8 + a9 ) + a10 = 120
99 + a10 = 120 Subtract 99 to both sides
99 + a10 - 99 = 120 -99
a10 = 21
Number 21 is removed.
the total of the 10 number is 120
solve
(120-x)/9 = 11
120-x = 99
-x = -21
x = 21
Related Questions
maths - 1).Last year, a shopkeeper sold an average of 7 cartons of apples from ...
math - Does anyone know how to explain mean, median, mode and range mean?? mean-...
math - The average (arithmetic mean) of 4 numbers is greater than 7 and less ...
math - the difference between two numbers is 5 the average of the number is 11 ...
arithmetic - If you treat the day of the month as a number (March 12th is the ...
Accounting - If you treat the day of the month as a number (March 12th is the ...
arithmetic - If you treat the day of the month as a number (March 12th is the ...
math - If the average of 11 numbers are 20 and the average of 3 numbers are 48, ...
Math - The average of the first 4 numbers is 14. The average of the next 6 ...
math - average of 6 numbers is 19.A seventh number is added and the new average ...
For Further Reading
