1.Express each of 45 and 120 as a product of prime factor .Hence, find the H.C.F and L.C.M. of 45 and 120.
2.There arre 6 Arts books in a bookcase.The number of Arts books in that bookcase is 25% that of scientific fictiions ,and the number of scientific fictiions is 40% of the whole number of books .How many books are there in the bookcase ?
maths
2007-08-22 11:16 pm
回答 (2)
2007-08-22 11:24 pm
✔ 最佳答案
145=3^2*5
120= 2^3*3*5
Hence,
HCF=3*5=15
LCM=2^3*3^2*5=360
2
Number of books
=6/25%/40%
=6/0.25/0.4
=60
There are 60 books in the bookcase
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