The symbol * specifies a calculation method, which is different from the familiar addition, subtraction, multiplication and division, but A*B=6A+4B in the condition. ...

So according to what is known,

X*8=6x+4 x 8=80, x=8 (here let A be X and B be 8).

So1/6 * (x *1/4) = 6x1/6+4 (x *1/4) =1+4 (x *1/4).

The first question: 8

Second question: 197

Don't thank me. I took the math entrance exam 139 and studied at Beihang University. . Hee hee. . .