It is c. that is because there are 10 red to 20 black which is a 10:20 ratio. you can simplify this to 1:2 since they are both divisible by 10
Take the lengths as 2x and 3x.
As per the question,
2x + 3x = 45
5x = 45
So, x = 45/5 = 9
To find the length of 1st segment : 2x = 2 * 9 = 18
And the length of the 2nd segment: 3x = 3 * 9 = 27
Hope this helps! :)
NiCad cells typically have a voltage of 1.2 Vdc.
