For liquid A and B mixed to reach a final temperature of 20∘C, the equation based on the heat exchanged is m×CB×(24−20)=m×CA×(20−15) Simplifying, we get 4m×CB=5m×CA ‌
CB
CA
=‌
5
4
For liquid B and C mixed to reach a final temperature of 26∘C, m×CC×(30−26)=m×CB×(26−24) we get, 4m×CC=2m×CB ‌