Assignment:
Sachi and Masami have their own secret recipe for making ice cream. They will tell you how much cream they use, but the won't tell you how many marshmallows they put in. Sachi will give you a few clues. She says,
"we put in more than 39. We put in fewer than 64. Masami always puts the marshmallows in 3 at a time, with none left over. I always put the marshmallows in 4 at a time, with none left over."
How many marshmallows do Sachi and Masami put into their ice cream?
Provide complete and step by step solution for the question and show calculations and use formulas.