Answer:
b = 10/3
Step-by-step explanation:
39=1 3/10b would be clearer if rewritten as 39 = (1 3/10)b. We are to solve this for the value of b.
Rewrite the mixed number 1 3/10 as 13/10. Then we have 39 = (13/10)b.
To isolate b, multiply both sides of this equation by 10/13:
10
---- * 39 = b, or b = 10/3
13
