The shares are 5, 1 and 3 units; 135 stamps are split into 9 units. Jill is 2 units more than Sarah.

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• Total units → 5 + 1 + 3 = 9
• 9 units → 135 stamps
• $$\frac{1}{1}$$ unit → 135 ÷ 9 = 15
• Jill → 5 × 15 = 75 stamps
• Sarah → 3 × 15 = 45 stamps
• Difference → 75 − 45 = 30

Jill received 30 more stamps than Sarah.
Check: May = 1 × 15 = 15. Total: 75 + 15 + 45 = 135. ✓