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2014-11-04T17:37:08+08:00

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Lets say that:
x=cost of pencil
y=paper
z=pen

and the given information means
y=x+7.80
z=y+12.40 or z=x+20.20

now to solve for x
x= \frac{76.60-(7.80+20.20)}{3}
x=16.20

y=16.20+7.80
y=24

z=24+12.40
z=36.4

check:
76.60=x+y+z
76.60=16.2+24+36.4
76.60=76.60
0
Nosebleed....TY though xD
thought you needed the computation
Its alright...I got the answer...