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.

22 and 22

step-by-step explanation:

10 plus 12 equals 22.

12 plus 10 also equals 22 because regardless of what order they're in, they're gonna equal the same thing.

answer: $201

step-by-step explanation: to get the answer, you first get 3 nieces that he sold and multiply it by 67 and get $201, so he earned $201 selling his nieces.