correct answer is: c) 5.5

Explanation

The LCM and HCF of two number are 11 and 1.1
And one number be 2.2
We know,
Product of Two Number = LCM \times HCF
\rightarrow 2.2\times Other Number = 11\times1.1
\rightarrow Other Number =\large\left(\frac{11\times1.1}{2.2}\right)
\rightarrow Other Number =\large\left(\frac{11\times11\times10}{22\times10}\right)
\rightarrow Other Number =5.5
Ans: The other number be 5.5

Other forms of this specific math question are:

1. If the least common multiple (LCM) and highest common factor (HCF) of two numbers are 11 and 1.1 respectively, and one of the numbers is 2.2, what is the other number?
2. Given that the LCM and HCF of two numbers are 11 and 1.1 respectively, and one of the numbers is 2.2, what is the value of the other number?
3. If one of two numbers is known to be 2.2 and their LCM and HCF are 11 and 1.1 respectively, what is the value of the other number?
4. When the LCM and HCF of two numbers are 11 and 1.1 respectively, and one of the numbers is 2.2, what is the value of the second number?