Answer:
53 cupcakes 
Explanation:
He has a total of 431 ounces and each cupcake needs 8 ounces of frosting. Therefore can divide the total amount of frosting (431 ounces) by the amount per cupcake (8 ounces) 
total amount/ amount per cupcake 
431 ounces/8 ounces 
431/8
53.875 
0.875, or a fraction/part of a cupcake can’t be frosted, so we should round down to the nearest whole number. 
53 
He can frost 53 cupcakes.