A roller coaster train with 6 passenger cars and the front decoration has a mass of 3,500 kg. When the train has
the front decoration and only 4 passenger cars, it has a mass of 2,400 kg

Each passenger car: 550 kg

Front decoration: 200 kg

Step-by-step explanation:

Mass of passenger car: p

Mass of front decoration: d

6p + d = 3500 (1)

4p + d = 2400 (2)

(1) - (2)

2p = 1100

p = 550 kg

4(550) + d = 2400

d = 2400 - 2200

d = 200 kg

for ex: the reciprocal of 3/4 is 4/3. it is the opposite.

reciprocal definition:

a mathematical expression or function so related to another that their product is one; the quantity obtained by dividing the number one by a given quantity.