U can use the second last one
X + 90 = 2x + 40
First find the circumference of the circle.
Circumference:

Plug in 20 for the radius (r).

= 125.66
The circumference of the circle is 125.66 cm.
Now to find this in meters... there are 100 centimeters in 1 meter.
Divide 125.66 by 100 to find how many meters this is.
125.66 ÷ 100 = 1.26
The circle's circumference is 1.26 meters.
We can divide each digit by 7. So 56/7=8 and 21/7=3
so.... 8:3