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2. The greatest common factor and least common multiple of two numbers are 3 and 180, respectively. One of the numbers is 12. What is the other number?

A. 54
B. 45
C. 40
D. 50


Sagot :

To solve this problem, we can use the relationship between the greatest common factor (GCF), least common multiple (LCM), and the two numbers. This relationship is given by the formula:

[tex]\[ \text{GCF}(a, b) \times \text{LCM}(a, b) = a \times b \][/tex]

We are given:
- The GCF is 3.
- The LCM is 180.
- One of the numbers (let's say [tex]\( a \)[/tex]) is 12.

We need to find the other number ([tex]\( b \)[/tex]).

Using the formula, we can substitute the given values:

[tex]\[ 3 \times 180 = 12 \times b \][/tex]

Let's solve for [tex]\( b \)[/tex]:

[tex]\[ 540 = 12 \times b \][/tex]

Dividing both sides by 12 to isolate [tex]\( b \)[/tex]:

[tex]\[ b = \frac{540}{12} \][/tex]

[tex]\[ b = 45 \][/tex]

Thus, the other number is:

(b) 45