A car mechanic has a tin containing 5 litres of engine oil - OCR - GCSE Maths - Question 3 - 2021 - Paper 1
Question 3
A car mechanic has a tin containing 5 litres of engine oil.
Each week they use 450 millilitres of this oil for their vehicles.
The car mechanic says
After 9 weeks ... show full transcript
Worked Solution & Example Answer:A car mechanic has a tin containing 5 litres of engine oil - OCR - GCSE Maths - Question 3 - 2021 - Paper 1
Step 1
Calculate the total amount of oil used in 9 weeks
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
To find the total amount of oil used in 9 weeks, we multiply the weekly usage by the number of weeks:
450extml/week×9 weeks=4050 ml
To convert millilitres to litres, we remember that 1 litre = 1000 millilitres:
4050 ml÷1000=4.05 litres
Step 2
Determine 80% of the total oil in the tin
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Next, we calculate 80% of the total oil in the tin, which is 5 litres:
0.80×5 litres=4 litres
Step 3
Compare the oil used and 80% of the tin
96%
101 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Now we compare the total amount of oil used (4.05 litres) with 4 litres. Since 4.05 litres exceeds 4 litres, the mechanic's statement is correct.
Thus, after 9 weeks, the mechanic would have used over 80% of the oil in the tin.
