You can prove that a=5, b=3, 5=3+2 and a=b+2.
Step-by-step explanation:
6.5r - 7.4= 12.1
6.5r = 19.5
r = 3
Your correct it’s the first one
the probability is 5/15 or 1/3.
You add up all the coins (5+10=15) and since there’s 5 blue coins in the bag, you put 5 over 15. You simplify that to 1/3.
hope this helped !!
