Step 1a

Here a : b = \$3 : 4\$ and b : c = \$2 : 5\$

Explanation: Given ratio one is \$3 : 4\$, and the ratio 2 is \$2 : 5\$.

Step 1b

Just multiply with such a number that the B are same Here a : b is multiplied by 2, i.e., a : b =\$ (3 : 4 ) 2\$ = \$6 : 8\$.

Explanation: Here, we can multiply the first ratio by 2 then we get \$6 : 8\$.

Step 1c

Here b : c is multiplied by 4, i.e., a: b = \$(2: 5 ) 4\$ = \$8 : 10\$.

Explanation: Here, we can multiply the second ratio by four then we get \$8 : 10\$.

Step 1d

So, the new ratio is a : b : c is \$6 : 8 : 10\$.

Explanation: Therefore, the new ratio a : b : c is \$6 : 8 : 10\$.