The average weight of 5 packets is 24 kgs and the average weight of another 10 packets is 12 kgs, then average weight of 15 packets is ………………. 

C) Weight in kgs /height in metres/ squared

Correct Answer - 45 kg

Correct option is (B) 16 Kgs Average weight of 15 packets \(=\frac{5\times24+10\times12}{15}\) \(=\frac{120+120}{15}\) \(=\frac{240}{15}\) = 16 kg

D) ‘A’ is incorrect, ‘R’ is correct.

Correct option is (B) \(10\frac{1}{4}\) kg Total weight = \(5\frac{3}{4}\) + \(4\frac{1}{2}\) \(=\frac{5\times4+3}4+\frac{4\times2+1}2\) \(=\frac{23}4+\frac92\) \(=\frac{23+9\times2}4=\frac{23+18}4\) \(=\frac{41}4=\frac{40+1}4\) \(=10+\frac{1}{4}\) = \(10\frac{1}{4}\) kg.

(D) 25 – 30 kgs

Correct option is (B) ₹ 3000 \(\because\) The cost of 65 packets of tea = Rs 2600 \(\therefore\) The cost of 75 packets of tea \(=Rs(\frac{2600}{65}\times75)\) \(=Rs(\frac{200}{5}\times75)\) \(=Rs(200\times15)\) = Rs 3000

Correct Answer - c Average = `("Sum of the quantities")/("Number of the quantities")`