Find the value of x so that the given numbers are in proportion
x:5::15:25
4
3
5
2
When the numbers are in proportion , we have product of means = product of extremes
In the given numbers x:5::15:25
∴ 5×15 = x×25
75 = 25x
x = 3
Find the number of elements of × which satisfy the inequation
−2≤(12)−(2x3)≤1(56), x ϵ N