Question

3. Find x when :
(i) 10 : 15 :: x : 9
(ii) 75 : 30 :: 30 : x
Ratio and proportion class-7 ​

Answer 1

Answer:

(i) 6

(ii) 12

Step-by-step explanation:

(I)

10/15:x/9

10*9=15*x

x=90/15=6

(ii)

75/30=30/x

75*x=30*30

x=900/75=12

Answer 2

Answer:

$\huge\rm\blue{Answer}$

Proportion =

$= \frac{10}{15} = \frac{x}{9}$

$= 10 \times 9 = x \times 15$

$= \frac{10 \times 9}{15} = x$

$= \frac{90}{15} = x$

$= 6 = x$

Proportion =

$= \frac{75}{30} = \frac{30}{x}$

$= 75 \times x = 30 \times 30$

$= x = \frac{30 \times 30}{75}$

$= x = \frac{900}{75}$

$= x = 12$

@MissOxford