Level 3
Two hours ago, a stallholder started his day with some durians and apples in the ratio of 5 : 2. There were 100 apples. Some of the durians were bought by Mrs Olivia. As a result, the number of durians became 35 of the apples.
How many durians did the stallholder have left?
How many durians must the stallholder buy in order to have an equal number of durians and apples?