the cost of 15 packets of biscuits, each weighting 750 grams, is rs. 300. what will be the approximate cost of 25 packets, if each packet weighs 1 kg? (note: it is known that cost of each packet depends on its weight)
Answers
Find the weight of the 15 packets:
1 packet = 750g
15 packets = 750 x 15 = 11,250g
Find the cost of 1 g of the biscuit:
15 packets = Rs 300
11,250g = Rs 300
1g = 300 ÷ 11250
1g = Rs 2/75
Find the weight of 25 packets:
I packet = 1 kg
1 packet = 1000g
25 packets = 25 x 1000 =25,000g
Find the price of biscuits:
1g = Rs 2/75
25000g = 2/75 x 25000 = 666.67 ≈ Rs 667
Answer: The cost of the 25 packets will be Rs 667
Given:
15 packets,
Cost = 300 Rupees
Weight = 750 g
To find:
The approximate cost of 25 packets, if each packet weighs 1 kg
Solution:
The cost of 15 packets = 300 Rupees
The weight of 15 packets = Weight * 15
750 x 15
The weight of 15 packets = 11250 g
To find the cost for 1 g,
300 ÷ 11250
1 g costs 0.026 Rupees
To find the cost for 1 kg,
1000 g = 1 kg
0.026 * 1000
Cost for 1 kg = 26.6 Rupees
To find the cost for 25 packets,
25 * 26.6 = 666.78
Hence, the approximate cost of 25 packets, if each packet weighs 1 kg is 667 Rupees