Rehna used 1/6 of a packet of flour to make some muffins and 1/4 of it to make a cake.
She used the remainder to make some cupcakes. She used 1/12 of the pocket of flour
for each cupcake. How many cupcakes did she make?
x - 1/6x - 1/4x = flour left to make cupcakes
1 - 1/6 -1/4
12/12 - 2/12 - 3/12 = 7/12
she needs 1/12 for each cupcake .... so 7 cupcakes can be made