The linear equation 3x − 5y = 15 has

The graph of a linear equation 2x + 5y = 10 is a line, which meets the x-axis at the point

A zoo has some lions and parrots. The keeper counted 15 heads and 50 legs. Number of lions is

Mode of the observations 10, 11, 16, 17, 12, 13, 17, 16, 16, 12, 16, 10, 15, 16, 10 is

If x, y, z are natural numbers, then the number of different solutions of the equation x + y + z = 6 are:

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