His answer is not correct because when you add fractions, the sum is always greater than 1 1 . His answer is not correct because the sum cannot be less than either addend. His answer is correct because 12 + 1 = 13 12 + 1 = 13 and 15 + 10 = 25 15 + 10 = 25 . His answer is correct because all the fractions are less than 1

b)

Step-by-step explanation:

Here, answers a) and d) are not correct because here we do not have fractions, we have whole numbers.

Also, answer c) is not correct because the result is greater than each number we added.

The conclusion is that answer b) is correct because we add the first two last digits, ten and a unit, and the hundredths.

i dont know

step-by-step explanation:

answer: x=60