Math, asked by navya082003, 1 year ago

how can we find out that in a question we have to find LCM or HCF ?

Answers

Answered by 22072003

If the question demands "Minimum", then $<b>LCM</b>$ will be used.

For example : When the question asking the time.

If the question demands "Maximum", then $<b>HCF</b>$ will be used.

navya082003: Three measuring rods are 64 CM 80 cm and 96 CM in length Find the least length of cloth that can be measured and exact number of times using any of the rods

navya082003: in the above question we have to find LCM or HCF ?

22072003: Use LCM.

navya082003: how come you so sure ?

22072003: Because in the question, it is that we have to find the least length. And if we expand LCM, we get LEAST common factor. That's why, LCM will be used.

navya082003: let me give you one more such question

Answered by Anonymous

LCM
Three traffic signals change from Red to Green in 10, 15 & 20 seconds respectively. After how much time will all three signals together become Green ?
First : 10,20,30,40,50,60,70,80 …..
Second : 15,30,45,60,75,90 …
Third : 20,40,60,80

HCF

Square towels has to be cut from a piece of cloth measuring 16m x 20m. What is the minimum number of towels that can be cut so that there is no wastage ?

HCF(16,20) = 4
So, the dimension of towel is 4m x 4m
The minimum number of towels possible is (16 x 20 )/ (4 x 4) = 20.

Anonymous: hi

navya082003: hello

Anonymous: we can be friends

navya082003: Three measuring rods are 64 CM 80 cm and 96 CM in length Find the least length of cloth that can be measured and exact number of times using any of the rods

navya082003: in the above question we have to find LCM or HCF ?

Anonymous: sorry

22072003: Use LCM.

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