Answer:
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 [tex]x[/tex].
According to question:
[tex]x - 3 \%ofx= 388[/tex]
⇒[tex]x-\frac{3}{100}\times x = 388[/tex]
⇒[tex]x-0.03x =388[/tex]
⇒[tex]0.97x=388[/tex]
Dividing both sides by 0.97 we get:
⇒[tex]x=400[/tex]
Therefore, their mass at the start was 400 kg.
