Answer:
12 divided by 1.5 = 8 tapes
Hope this helps you
Expand the equation.
Multiply (distribute) the first numbers of each set, outer numbers of each set, inner numbers of each set, and the last numbers of each set.
Combine like terms.
Solve the equation and simplify, if needed.
The value of a would be 3.5, as a=1 when b=10 means that a is worth 1/10 of b's value.