The number of multiples of 4 lie between 10 and 250 is 

The multiples of 4 between 10 and 250 are 12, 16, 20, 24, …. 248

Here a = 12, d = 4, l = 248

$a+(n-1)d=248$

$12+(n-1)4=248$

$n-1=\frac{236}{4}$

$n=59+1$

$n=60$