Write more than 2 / 3, less than 6 / 7, and the numerator is a simple fraction of 5

Write more than 2 / 3, less than 6 / 7, and the numerator is a simple fraction of 5

2 out of 3 = 14 out of 21
6 out of 7 = 16 out of 21
There's obviously a 15 out of 21 relationship between them
15 out of 21 = 5 out of 7
So the answer is five out of seven

8.5 - (5.6 + 4.8) / 1.3 (4 / 5 + 1 / 4) / 7 / 3 + 7 / 10
Calculation by the formula of "want to take off"

The answer is 333

1 / 2 × 4 / 3 × 6 / 5 × 8 / 7 X 99 / 100 and 1 / 10

Let a = 1 / 2 * 3 / 4 * 5 / 6 *. 99 / 100
b=2/3*4/5*6/7*.100/101
a*b=1/2*2/3*3/4*4/5*.99/100*100/101=1/101
Because 1 / 2 < 2 / 3; 3 / 4 < 4 / 5; 5 / 6 < 6 / 7.99/100 < 100 / 101
So a