During a grand prix car race, the tyres on a car are reduced in mass by 3%. if their mass is 388 kg at the end of the race, what was their mass at the start?

Their mass at the start was 400 kg.

Step-by-step explanation:

Given:

The tyres on a car during a grand prix race are reduced in mass by 3%. Their mass is 388 kg at the end of the race.

Now, to find the mass at the start.

Let the mass at the start be .

According to question:

⇒

⇒

⇒

Dividing both sides by 0.97 we get:

⇒

Therefore, their mass at the start was 400 kg.

answer: 1) twenty-seven times y

              2) twenty-seven multiplied by y