(I crossed simplify)
Next cross multiply;
3b = 1
b = 1/3
To check if the statement is true just substitute the value of b in the equation;
3b = 1
3(1/3) = 1
1 = 1
I so understand that doesn't mean I so
Answer:

Step-by-step explanation:
120cm^3
You flip the second fraction and you multiply. 1 and 2/5 or 1.4