This question was previously asked in

MPPEB Stenographer 15 Sept 2018 Shift 1 Official Paper

Option 3 : 5.64 gm

**Given:**

Average weight of 40 balls = 4 gm

**Formula:**

Average = Sum of terms/Number of terms

**Calculation:**

New average weight of bag and balls = 4 + 0.04 = 4.04 gm

Total weight of bag and ball = 4.04 × (40 + 1) = 165.64 gm

Total weight of balls = 40 × 4 = 160gm

**∴ Weight of bag = 165.64 - 160 = 5.64 gm**