If four children take four hours to make a sand castle, how long would it take three children to make the same sand castle?

i believe it's 5.2 hours. not sure tho :/

to determine the unit cost your would divide the total cost by the number sold.

7 bagels for $4.41       $4.41/7 = $.63 each at fresh side

5 bagels for $3.60         $3.60/5 = $.72 each at value mart

x< -17/2 hope this