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Mathematics 12 Online
OpenStudy (samara8954):

Solve for n.

OpenStudy (samara8954):

OpenStudy (mokeira):

cross multiply

OpenStudy (samara8954):

n = 2 n = 36 n = 7 n = 14

OpenStudy (mokeira):

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OpenStudy (samara8954):

help still

OpenStudy (mokeira):

ok, what do you get when you cross mutliply

OpenStudy (samara8954):

i don't know

OpenStudy (mokeira):

6 x n= 21 x 2 what do you get when you multiply each side

OpenStudy (samara8954):

47 and 7

OpenStudy (mokeira):

what is 6 x n

OpenStudy (samara8954):

7

OpenStudy (mokeira):

how did you get 7?

OpenStudy (mokeira):

\[6 \times n\]

OpenStudy (mokeira):

we do not know what n is

OpenStudy (samara8954):

ok

OpenStudy (mokeira):

what is 21x2?

OpenStudy (samara8954):

42 so the answer is 7

OpenStudy (mokeira):

oh, i get what you were saying...yes you are right its 7...i was a bit slow lol :)

OpenStudy (samara8954):

OpenStudy (samara8954):

help

OpenStudy (samara8954):

n = 330 n = 5 n = 12 n = 60

OpenStudy (mokeira):

once again cross multiply

OpenStudy (samara8954):

so

OpenStudy (mokeira):

5x72 = 30xn

OpenStudy (samara8954):

360

OpenStudy (samara8954):

so the answer

OpenStudy (mokeira):

360=30xn and you want to find n so divide both sides by 30

OpenStudy (samara8954):

12

OpenStudy (mokeira):

yeah

OpenStudy (samara8954):

360/30=12

OpenStudy (mokeira):

correct so n=12

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