Answer:
Ratio = 1 : 4
Step-by-step explanation:
Total marbles = 10
Given 1/5 is red, that is 1/5 of the total marbles are red

Therefore , 10 - 2 = 8 marbles are blue.
Ratio of red marbles to blue marbles

Use 80% *25 than you can get 20.
Answer:
area of circle=πr²=3.14×5²=78.5unit²
The answer is b 5x-y=7 2x+y=0