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For our convenience let us multiply all the numbers by 100.
Given eqn: 35P+45N ;N=?
(I) P=N ; 35P+45P nothing helps as we dont have RHS of the eqn.
(II) 35P+45N=320
=> 7P+9N=64
Only when P=4 and N=4 the eqn holds good. We can have different decimals but number of pencils and number of notebook cant be in decimals. SUFF
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