The number of cups that Juanita will need will be given by:
Number of cups needed=(required quantity)/(number of cups Juanita has)
required quantity=3 1/2=3.5 cups
number of cups Juanita has=1/4=0.25
therefore the required amount will be:
3.5/0.25
=14 cups
Juanita will need 14 cups of floor to prepare the bread.