Question

at the malt shop a large chocolate shake takes 8/9 of a point of milk, of the medium shake takes 1/7 the amount of a latge how much does the medium shake take

Answer 1

8/9 + 1/7= 56/63 + 9/63= 56+9= 65/63 = 1  2/63     
it equals 1 and 2 over 63

Answer 2

Step one : cross multiple 8/9-1/7 : like this /8Times 7, 9Times7,1Times9 and 7Times9.

Step two : U should get your answerwhich is 47/63

Hope this helps:)