Question

If p:q = 3:5 and q:r = 7:2 express p:q:r.
Also find r:p​

Answer 1

Step-by-step explanation:

p:q:r=3×7:5×7:2×5

=21:35:10

r:p=10:21

Answer 2

Your question ,

If p:q = 3:5 and q:r = 7:2 express p:q:r.

Also find r:p

Your answer ,

Given ,

• p : q = 3 : 5
• or p / q = 3 / 5

• q : r = 7 : 2
• or q / r = 7 / 2

Findin p : q : r ,

• Let 'p' be = 3 x

• q = 5x

So ,

• q : r = 7 : 2 will be ,

$\frac{q}{r} = \frac{5x}{5x \times \frac{2}{7} }$

• q = 5x

• r = 2 x 5x / 7

So ,

• p : q : r. will be ,

• 3 : 5 : 1.42

Finding r : p ,

$\frac{r}{p} = \frac{5 \times \frac{2}{7} x}{3x} = \frac{10}{21}$

• r : p = 10 : 21