Two pen

Two pen and one notebook costs $56. One pen costs 1/5 of one notebook. How much is the one notebook?

Correct result:

n =  40

Solution:

2p+n = 56
p = n/5

2•p+n = 56
p = n/5

n+2p = 56
n-5p = 0

n = 40
p = 8

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