Use units to track the changes and find the new ratio.<br><br>
[[model:questions/solutions/q10434.png]]<br><br>
Let men = \(2u\) and women = \(3u\).<br>
&bull; 25% of men left, so men remaining = 75% of \(2u = 1.5u\).<br>
&bull; 20% of women left, so women remaining = 80% of \(3u = 2.4u\).<br>
&bull; New ratio = \(1.5u : 2.4u = 1.5 : 2.4 = 15 : 24 = 5 : 8\).<br><br>
The new ratio of men to women is 5 : 8.<br>
Check: Men: 2u → 1.5u. Women: 3u → 2.4u. 1.5:2.4 = 5:8. ✓