20% of 100 is 20. divide that by 2 to get 20% of 50. 20/2 is 10. 20% of 50 is 10. There are 10 blue marbles.
Hope it helped :)
Ali
For this case we must find an expression equivalent to
. To solve we follow the steps below:
We apply distributive property to the terms within the parenthesis taking into account that
:

We add common terms taking into account that equal signs are added and the same sign is placed:

Answer:
Option C