Answer: option 3
PLEASE MARK ME AS BRAINLIEST
3 is to 5 as x is to 20
5 goes into 20 4 times so 3(4) gives you x
and x=12
You can write 2311 and 3912 in the form
:


Then


Taken modulo 20, the terms containing powers of 20 vanish and you're left with

We further have

so we end up with

and so
.
###
If instead you're trying to find
, you can apply Euler's theorem. We can show that
using the Euclidean algorithm. Then since
, and 8 divides 3912, we have

To show 2311 and 20 are coprime:
2311 = 115*20 + 11
20 = 1*11 + 9
11 = 1*9 + 2
9 = 4*2 + 1 => gcd(2311, 20) = 1
=26
Explanation: 6 x 5 (c) = 30 30 - 4 (a) =26
Hope that helps :)
|yyyyyytyyyyyyhggI nushehehehhehehehhehehehehehhehehehdhdhdhhdhhhheheheheheheh lol 6×7=42