23. a) Show that the number of positive integers less than or equal to x that are divisible by the positive integer d is given by [x/d]. b) Find the number of positive integers not exceeding 1000 that are divisible by 5 , by 25 , by 125 , and by 625 . c) How many integers between 100 and 1000 are divisible by 7 ? by 49 ?
A number or a short expression. Spacing, $ signs and \frac vs / are all fine.
Official solution
25. .) 200,40,8,1 c) 128,18
Source: NuminaMath-1.5,
licensed Apache-2.0.
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