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- anonymous

A survey was conducted among 400 students of age groups 7–12 years and 13–18 years to find their favorite music genre. The students had to select any one genre out of jazz, rock, and pop. Out of the 200 students in the age group 7–12 years who participated in the survey, 142 liked rock or pop music. The total number of students of both age groups who liked jazz was 72.
Using a two-way table, compute the total number of students in the age group 13–18 years who liked rock or pop music.
122
130
142
186

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- anonymous

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- anonymous

- anonymous

how

- Vocaloid

whoops, small correction, the circled value should be this one|dw:1438208408869:dw|

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- Vocaloid

anyway, the first row tells us that
(number of kids aged 7-12 who like jazz) + (number of kids aged 7-12 who like rock or pop) = 200
find the number of kids aged 7-12 who like jazz

- Vocaloid

|dw:1438208711189:dw|
I have to get going, but maybe this will help explain it a bit better?

- Vocaloid

A + 142 = 200
A + B = 72
B + C = D
200 + D = 400
the value we want to find is C

- Vocaloid

first find A, then B, then D, and then you can use that information to find C

- LynFran

good explanation @Vocaloid

- anonymous

kk

- anonymous

idk how

- anonymous

srry

- anonymous

- LynFran

to find A
A+142=200
A=200-142
A=?

- anonymous

58

- LynFran

good
now A+B=72
A=58 so
58+B=72
B=72-58

- anonymous

14

- LynFran

good B+C= D
lets look at the last equation
200+D=400
D=400-200
D=?

- anonymous

200

- LynFran

good now B+C=D
and B=14 and D=200
so 14+C=200
c=200-14
c=??

- anonymous

186

- LynFran

yep

- anonymous

thx

- LynFran

welcome thanks to @Vocaloid

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