Test scores
Ivan, Tibor and Alex sat a test and achieved 85%, 90% and 95% respectively. Tibor scored just one more mark than Ivan. How many marks did Alex get?
Age
14 to 16
Challenge level
Problem
Ivan, Tibor and Alex sat a test and achieved $85\%$, $90\%$ and $95\%$ respectively. Tibor scored just one more mark than Ivan.
How many marks did Alex get?
If you liked this problem, here is an NRICH task which challenges you to use similar mathematical ideas.
Student Solutions
Answer: 19 marks
Ivan 85%
$\downarrow$ 1 mark = 5% $\therefore$ 20 marks = 100%
Tibor 90%
So Alex got 95% of 20 marks = 19 marks