If 10 → 4, 18 → 6 and 30 → 8, then 48 → ?

If 53 = 10 and 78 = 49, then 67 is equal to

If a+b=13 and a³+b³=559, find a²+b².

Find the remainder when 49^49 + 1 is divided by 6.

In an enclosure there are crows and cows. If there are 30 heads and 100 legs, what is the ratio of cows to crows?

If the median of observations 12, 1, 8, 54, 61, 28, 45, 35, 21, 17 is M, then what is the value of 2M + 5?