Final answer:
Sumer can make 30 packets of toffees.
Step-by-step explanation:
To find the number of packets that can be made, we need to divide the total weight of toffees by the weight of each packet. Sumer has 30 packets of toffees, where each packet weighs 3 by 8 kg. To make packets of 2 1 by 40 kg each, we need to convert the weight of each packet to the same unit. So, 3 by 8 kg can be converted to 2 1 by 40 kg by multiplying both the numerator and denominator by 5. Now, we can divide the total weight of toffees (30 packets x 2 1 by 40 kg) by the weight of each packet (2 1 by 40 kg) to find the number of packets that can be made.
30 packets x 2 1 by 40 kg = 60 1 by 2 kg
60 1 by 2 kg ÷ 2 1 by 40 kg = 30 packets
Therefore, Sumer can make 30 packets of toffees.