a certain store sold pens for $ 0.35 each and pencils for $ 0.25 each . if a customer purchased both pens and pencils from the store for a total of $ 1.60 , what total number of pens and pencils did the customer purchase ?
"answer : algebraically , the question looks like this : 2.5 = 0.35 x + 0.25 y . there are six possible numbers of pencils that fit that requirement : 1 pen : $ 0.35 and 5 pencils for $ 0.25 each . that ' s 1 pens and 5 pencils for a total of 6 pens and pencils . choice ( a ) is correct ."
multiply(divide(1.60, add(0.35, 0.25)), const_2)