How many positive integers less than 103 have an odd number of positive divisors?

The only positive integers that have an odd number of positive divisors are perfect squares, so the only positive integers less than 103 that have an odd number of positive divisors are 1, 4, 9,. . ., 100. There are 10 of these numbers.

Step-by-step explanation:

the forst and 3rd

step-by-step explanation:

it's equivalent, so we can say that its equal.

let's call the denominator x and the numerador is 18 less then denominator, x - 18.

multiply

2.x = 5.(x - 18)

2x = 5x - 90

90 = 5x - 2x

90 = 3x

x = 90/3

x = 30

so: