Pamela is 6 years younger than Jiri. The sum of their ages is 36. What is Jiri’s age?

21 years.

Step-by-step explanation:

Let Jiri's age be x years, then Pamela's age is x - 6 years.

The sum is 36 so we have the equation:

x + x - 6 = 36

2x = 36 + 6 = 42

x = 42/2 = 21.

1/4 and 8/3 because:

the reciprocal if 4 is 1/4 because 4 is used as 4/1 and the opposite of that is 1/4. the opposite of 3/8 is 8/3 so that is the answer.