Respuesta :

Answer:

C, 35 yellow books

Step-by-step explanation:

There are 10 books in total

if 3 of them is equal to 21, then one book in the picture is worth 7 books

5 yellow books can be seen thus 7x5=35

Melody08

Answer:

C. 35 yellow books

Step-by-step explanation:

Let u be 1 unit.

3u = 21

u = 21÷3

=7

5u = 7×5

= 35