Answer:
4.2 kg
Step-by-step explanation:
Multiply 3/5 by 7 kg, which is the same as multiplying 3 by 7 and dividing the result by 5.
3/5 * 7 = 3/5 * 7/1 = (3 * 7)/(5 * 1) = 21/5 = 4.2
Answer: 4.2 kg
