What is 2/5 x "b"
$$\frac{2}{5}\times b = \frac{2}{5}\times \frac{b}{1}=\frac{2b}{5}$$
"b" is a variable, which represents any number. Here's a link to a good definition!!!
https://www.mathsisfun.com/definitions/variable.html
Just ask me if you have any more questions on this!!!
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