Answer:
A
Step-by-step explanation:
30:18 /6 =5/3
15:9 /3 =5/3
20:12 /2 =5/3
The process is:
C = 2nr
2nr = c
r (2n) = c

That's the answer☝️☝️☝️☝️
or maybe this one
r = 2n + c
sorry, I'm unsure, it has been too long since I studied that...
Answer:
$5.4
Step-by-step explanation:
45% of $12.00 = 45/100 x 12
= $5.4
Hence to get how much he saved, we have to deduct the percentage off from the cost price $12 -$5.4 = $6.6
∴ Jason saves $5.4
Euro tunnel : - 115 (115 m below sea level of 0)
-115 = S - 50
-115 + 50 = S
- 65 = S....the sea bed is -65 m (or 65 m below sea level