hugomimihu

Oh yes, sorry, I misread the problem. It is indeed 14 and 42, let me change that! Thanks!

Yeah, me too! 52.5 pts for a sixth grader. SOBS! 

Don't worry, I'm fine, and PLEASE don't give me any comfort.

Would you like comfort?

Let's use the reverse process. Assume p is Mr.Perez's age and d is his daughter's age. Because there are two people's ages combined, we multiply 15 by 2, =30. 86-30 = 56.The ratio p:d is 3:1, 3+1 = 4, and 56/4 = 14. 14*3 gives us 42. 

To check, 42/3 = 14, 42+14+15+15=56+30=86.

Mr.Perez is 42 now, and his daughter is14  now. If you  have any questions, don't hesitate to ask. :)

Perhaps you could use the thumb as a variable(t)... You use the length between the two sides, probably at the base of the nail, and count. Remember, you need to keep track of your starting point and don't forget to go in a straight line! Assuming you count x 'thumbs', even if x is a decimal, we do tx and that's the approximate circumfrence. Good luck! This is an intriguing question...

So you have 2 courses, 70% of A for course one, and 80% for course 2, and 90% chance to pass at least one? That doesn't make sense... also, I'm not sure about what a passing grade is, and there is also insufficent information to determine the answer. At least that's what I think. Sorry I couldn't help you!

https://dnalc.cshl.edu/resources/3d/13-transcription-advanced.html

Yes, it's transcription. The weblink above should help you.