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Natalija [7]
3 years ago
15

What is the unknown denominator if 9/12 = 3/

Mathematics
2 answers:
LiRa [457]3 years ago
7 0
Solve as a proportion:

\frac{9}{12}=  \frac{3}{x}

x = ?

Cross multiply:-

3 × 12 = 36

Divide:-

36 ÷ 9 = x
36 ÷ 9 = 4
x = 4

9/12 = 3/4

The unknown denominator is 4. <span />
adelina 88 [10]3 years ago
7 0
Do cross multiplication.

9              3
__   =        __
12            x

12×3=36. So now you found that out you will do a equation. Solve it.

9x=36
÷9   ÷9
________
x= 4

Now you got what the unknown denominator is. It's x=4. So 4.
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