Question 60675
HEADS=B+D
22=B+D
B=22-D
FEET=2B+4D
68=2B+4D SUBSTITUTE (22-D) FOR B IN THE FEET EQUATION WE GET
68=2(22-D)+4D
68=44-2D+4D
68-44=2D
24=2D
D=24/2
D=12 ANSWER
22=B+12
B=22-12
B=10  ANSWER
PROOF
68=2*10+4*12
68=20+48
68=68