If the cost price of 15 oranges is equal to the selling price of 20 oranges, the loss percent is:

If $$A = (-14 + 4)  and  B = 4 - 14$$, then $$AB = $$

If 22, x, 88 are in a continued proportion, find the value of x.

If 24.2kg of ghee costs ₹ 12525.92, how much would 8.5 kg of the same ghee cost?

The average marks obtained by a group of 10 students were 20. One student left the group as a result of which the average of the remaining students rose to 21. But another student joined, as a result of which the average marks of the group dropped a bit and became 20.6. What were the average marks obtained by the student who left and the one who joined?