Answer:2:4:5
Step-by-step explanation:
It their ages are 15, 35, 45 because we know 7 in that ratio is 35(25+10)
Then if you add 5 to all their current ages:20, 40, 50
And you can simplify that to:2,4,5
X/40 = 7/20
40/20=2
x=7x2=14
14 red marbles
Hope this helps.
The correct answer 19.42
circumference of a circle= 2(3.14)r
2(3.14)(3)=18.84 but its half a circle so divide by 2 18.84/2=9.42
9.42+6+4=19.42