Prime number- a number that has only two factors.
x + y = 53
x -y = 9 Adding both equations
2x = 62
x = 31 y = 22
A is your answer
We can cross multiply using x/70=30%/100
Solving it we get:
100x=2100 (70 times 30)
x=21
So we get a, 21 as your answer.
I hope this helped!
Answer:
see work attached and shown
C.) I’m pretty sure hope I could help