Question number 1: 5/8 (16b+24) - 1/2b

Question number 2: 3/4 (16/64 + 12a) - 9a

Problem 1. (19/2) b + 15

Problem 2. 3/16

Step-by-step explanation:

Question number 1

5/8 (16b+24) - 1/2b =

= (5/8) * (16/1) * b + (5/8) * 24 - (1/2) b

= 10b + 15 - (1/2) b

= (20/2) b - (1/2) b + 15

= (19/2) b + 15

Question number 2

3/4 (16/64 + 12a) - 9a =

= (3/4) * (16/64) + (3/4) * 12a - 9a

= (3 * 16) (4 * 64) + (3/4) * (12/1) * a - 9a

= (3 * 1) (4 * 4) + (3 * 12) / (4 * 1) * a - 9a

= 3/16 + (3 * 3) / (1 * 1) * a - 9a

= 3/16 + 9a - 9a

= 3/16