'Suppose `p , q ,r and s in NN` satisfying the relation `p+1/(q+1/(r+1/s))=(89)/(68)`

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"Suppose `p , q ,r and s in NN` satisfying the relation `p+1/(q+1/(r+1/s))=(89)/(68)`
,then find the value of `(p q+r s).`"
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