Mathematics is 9 units and Science is 5 units. 9 units of Mathematics equal 90 marks.<br><br>[[model:questions/solutions/q4484.png]]<br><br>• Mathematics → 9 units = 90 marks<br>• $$\frac{1}{1}$$ unit → 90 ÷ 9 = 10 marks<br>• Science → 5 units = 5 × 10 = 50 marks<br>• Difference → 90 − 50 = 40 marks<br><br>He scored 40 more marks for Mathematics than Science.<br>Check: 90 : 50 = 9 : 5. ✓