A smaller parcel and a larger parcel have masses in the ratio 2:3. The larger parcel is 54 kg. What is their total mass?

Объяснение

Three parts correspond to 54 kg, so each part is 18 kg; all 5 parts therefore weigh 90 kg. Adding 2 kg to 54 kg would confuse the smaller ratio term with the smaller parcel's actual mass.