in a city of total population 7/20th are women and 1/4th are children. hence find the number(fraction) of men
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we have a ratio of 3:2. we have to add them so we have 5, now we multiply 2 (ratio of cats) by 20 (the total number), which gives us 40, finally we divide 40 by 5 (3+2)= 8. similarly, we can multiply 3 (ratio of dogs) by 20 and then divide by 5= 12.
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Answer: Population of children =1/4
LCM=1×5/4×5
=5/20
Therefore population of men =7+5/20
=20-12/20
8/20 is the total number of men
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