in a scool strength of a girls is 3\5 of strength of boys then % of girls is
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Answer:
If 3/5 of the total number of students are girls, then 2/5 must be boys. Can't have any more than 5/5 in the whole. (Oh, go away gender-advocates!)
If I can figure out what 1/5 is, all I have to do is simple in-my-head nultiplication, and even this old brain remembers how to divide by two and mulitiply by three and five!
So if 2/5 is equal to 24, what is 1/5? Well, to go from 2/5 to 1/5, I divided 2/5 in half (by 2). I will do the same to 24. Half of 24 is 12 ( 24 divided by 2 is 12).
If 1/5 is equal to 12, then 2/5 is equal to 24. OK, that was a check. We are back to 24 boys. . If 1/5 is equal to 12, then 3/5 is equal to 3 x 12 or, come on, now, no calculator for this. 3 x 12 is 36. Thirty-six girls. Twenty-four boys plus thirty-six girls equals a full class of sixty. Wow! Must have been a class before contract class limits!
Check. Of course, if 1/5 is equal to 12; we can just multiply the 12 by 5 to get the total of 60. Then if some one asks who many girls there are, we can just subtract the number of boys from the total. That is 60 - 24 boys equals 36 girls.