Answer:
He is about 6 years old (5 years 11 months)
Step-by-step explanation:
13 - 7 and 3 - 2
Answer:

Step-by-step explanation:
Yes.
27/51-18/34=0
if something minus something is zero, then the 2 numbers subtracting each other are equal. :)
Answer:
A=50
Step-by-step explanation:
assuming you mean 100-A+20-70=0
you need to solve for A, which means add all your numbers together and isolate A.
-A+50=0
A=50