Question 1059356
If Mallory has x half dollars, then she has 4x quarters. So:
50x+25(4x)=6150
150x=6150
x=41
Mallory has 41 half-dollars and 164 quarters. 

Tony ate 1/4 of the pieces, and Dominic and Joseph  each ate 1/6th of the pieces, or 1/3 of the pieces. 1/4+1/3=3/12+4/12=7/12 represents the total amount of the sub eaten, leaving 5/12 of the sub left. If there are 5 equal pieces left, representing 5/12 of the original sandwich, then there were (5/12)/5, or 12 pieces originally. &#9786;&#9786;&#9786;&#9786;