I randomly choose a number between 2 and 12. What is the probability that 1 point
this number is prime? (Prime numbers are numbers whose Only factors are
1 and itself. Ex: 17) *hint-prime #/ total numbers

3, 5, 7, 11 are the prime

4/11 = 36.36%

36.36% percent the number will be prime

Step-by-step explanation:

let x and 400 - x be the two numbers.  

==> 0.80x + 0.85(400 - x) = 400 - 68 from the statement of the problem.  

< ==> 0.80x + 0.85(400 - x) = 400 - 68  

==> 340 - 0.05x = 332  

< ==> -0.05x = -8 ==> x = 160, the first number ==> 400 - x = 240, the second number.