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3 years ago

15

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

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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<u>Hint </u><u>:</u><u>-</u>

Break the given sequence into two parts .
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$\implies S_1 = a\dfrac{1-r^n}{1-r} \\\\\implies S_1 = \dfrac{1}{2}\left[ \dfrac{1-\bigg(\dfrac{1}{2}\bigg)^{25}}{1-\dfrac{1}{2}}\right]$

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$\rule{200}2$

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Your answer would be K/9b+ 4 = a

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