correct answer is: b) 0.7

Explanation

Here, the HCF of 2.1, 2.8 and 3.5 is the required greatest number.
Let, 2.1=21,\ 2.8=28 and 3.5=35
Now, HCF of 21, 28 and 35 is =7
So that, HCF of 2.1, 2.8 and 3.5 is 0.7
\therefore The greatest number is 0.7
Ans: 0.7 is the greatest number which must 2.1, 2.8, 3.5 be delivered to get integral quotients.

There’s another way to pose this same math question:

1. Finding the maximum whole number quantity for evenly distributing 2.1, 2.8, and 3.5 into integer amounts.
2. Determining the largest divisible quantity for 2.1, 2.8, and 3.5 to yield integer results.
3. What is the greatest common factor for distributing 2.1, 2.8, and 3.5 to ensure integral deliveries?
4. Finding the maximum integer divisor for delivering 2.1, 2.8, and 3.5 with whole number quotients.