1, numerator x, denominator 90-x, that is, x/(90-x)=7/8, that is, x=42, and the score is 42/48.

2. The same number is x, (97-x)/(181-x) = 2/5, that is, x=4 1.

3、(0.5+0.5)*(0.5+0.5)= 1

5、 1.5*3.5=5.25