Question

Word Problem help please

1. The magician said "The average of seven numbers is 49. If 1 is added to the fisr number, 2 is added to the second number, 3 is added to the third number and so on up to seventh number". what is the new average ?

Answer 1

can u help

Answer 2

11
is the average

Answer 3

step by step because i have no idea how u got that

Answer 4

\[49=\frac{x_1+x_2+...+x_7}{7}\]
\[\frac{x_1+1+x_2+2+..+x_7+7}{7}=\frac{x_1+x_2+...+x_7+28}{7}\]
\[=49+\frac{28}{7}=49+4=53\]

Answer 5

oh kk i have another word problem could u people help me

Answer 6

snaap ...

Answer 7

The average is equal to the sum of all the numbers divided by the number of numbers. So if the numbers add up to some number S, then the average A is

A = S/7


But we know that the average is 49, so A = 49, which means that

A = S/7

49 = S/7

49*7 = S

343 = S


So S = 343


Since we're adding 1 to the first, 2 to the second, etc all the way up to 7 to the seventh, we're basically adding 1+2+3+4+5+6+7 = 28 to S to get S+28, which means that the new sum is now S+28 = 343 + 28 = 371


Now divide this new sum by 7 to get 53


So the new average is 53

Answer 8

wait im getting confused ?

Answer 9

(49*7+28)/7=53

Answer 10

\[x_1+1+x_2+2+x_3+3+...+x_7+7
\]
\[(x_1+x_2+..+x_7)+(1+2+3+4+5+6+7)\]

Answer 11

whats the real answer

Answer 12

11 or 53

Answer 13

53

Answer 14

satellite and jim's 53

Answer 15

kk can u help with another one

Answer 16

kk can u help with another one

Answer 17

anybody

Answer 18

You can post a new question so all can see it.

Answer 19

kk in a given school, there 240 boys and 260 girls ...what is the ratio of numbers of girls to the number of boys ...what is the ratio of the number of boys to the total number of pupils in the school?

Answer 20

ratio of girls to boys = 260 / 240

Answer 21

ratio of boys to total pupils = 240 / (240+260) = 240 / 500

Answer 22

?? for first ? what isnt that just telling me girls to boys 260/240??

Answer 23

http://en.wikipedia.org/wiki/Ratio

Answer 24

ok so ready for next ?

Answer 25

why don't you ask a new question ?

Answer 26

1. if tim had lunch at $50.50 and he gave 20% tip. how much did he spend?

2. Find the greatest common factor of 24, 40 and 60 ?

3. in 2008 , the world population is about 6,760,000,000. Write the 2008 wolrd population in scientific notation

4. give the rules of divisibility ?

Answer 27

some of the rules