I think it could be 73. Because if you check what it the question says 73 fits them.
Answer:
+180
Step-by-step explanation:
M = 4.
The reason why is because you first have to add 0.05 and 18 together, and than multiply it by the closes number to 81.20 which is 4, and also it cannot be over 81.20.
Remember, you can do anything to an equation as long as you do it to both sides
we hate fractions so times both sides by 4
4A+8x-7x=8x+24a+8
combine like terms
4A+x=8x+24a+8
minus x both sides
4A=7x+24a+8
minus (24a+8) from both sides
4A-24a-8=7x
divide both sides by 7