To be a multiple of 4, 10 and 20 the number must be a multiple of their lowest common multiple. lcm(4, 10, 20) = 20 What is required is a multiple of 20 between 61 and 107. The numbers 80 and 100 both satisfy the problem of being between 61 and 107 and being a multiple of 4, 10 and 20.
4 is.
12?
20
Not always. Only multiples of 20 have both 10 and 4 as factors.
80 and 100 both qualify.
Any multiple of 12
The smallest number which is a common multiple of both 7 and 4 is 28.
It must be 10.
40 is the least number that is a multiple of 4 and 10. all multiples of 40 are multiples of 4 and 10 as well
24 is.
12