Child tickets : Adult tickets = 5 : 6. Let child tickets = 5u, adult tickets = 6u.<br><br>
[[model:questions/solutions/q5414.png]]<br><br>
&bull; Money from child tickets = 5u × $4 = 20u<br>
&bull; Money from adult tickets = 6u × $7 = 42u<br>
&bull; Total collected = 20u + 42u = 62u = $4030<br>
&bull; 1 unit = 4030 ÷ 62 = 65<br>
&bull; Adult tickets = 6 × 65 = 390<br>
<br>
390 adult tickets were sold.<br>
Check: Children = 325. 325 × $4 = $1300. 390 × $7 = $2730. $1300 + $2730 = $4030. ✓