Final answer:
To find two fractions that sum up to 9/10, both options A (3/10 and 6/10) and D (4/10 and 5/10) are correct, as they both add up to the desired sum.
Step-by-step explanation:
The question asks which two fractions add up to a sum of 9/10. Let's go through the options provided:
- A. 3/10 + 6/10 = 9/10 Correct
- B. 1/5 + 4/5 = 1/5 + 8/10 = 2/10 + 8/10 = 10/10 = 1 Incorrect
- C. 2/5 + 7/10 = 4/10 + 7/10 = 11/10 Incorrect
- D. 4/10 + 5/10 = 9/10 Correct
Both options A (3/10 and 6/10) and D (4/10 and 5/10) give us the desired sum of 9/10 when added together. Thus, both could be the correct pairs of fractions being sought in the question.