Question

Find the value of a and b respectively.
After applying invertendo to $3:5::8:9$ we get $5:a::b:8$ .

• A. $5$ and $8$
• B. $9$ and $3$
• C. $3$ and $9$
• D. $8$ and $5$

Answer 1

Answer: (C)

$3$ and $9$

If $a:b::c:d$ then $b:a::d:c$ is invertendo property of ratios

We have $3:5::8:9$

After applying invertendo we get

$5:3::9:8\equiv 5:a::b:8$

$a=3$ and $b=9$

Option C is correct