Question

Find the least number of six digits which is exactly divisble by 15,20 and 25

Answer 1

HCF of 15 20 and 25 is 150
then,
smallest 6 digit number = 100000
100000÷150=666 Remainder= 100
then, 100+50 = 150
so,
100000+50 = 100050 is the least six digit number exactly divisible be 15 20 and 25

Answer 2

hye

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aim : to Find the least number of six digits which is exactly divisble by 15,20 and 25

=>least number of six digits  = 10000

=>let us find the lcm of 15,20 and 25

=> 20 = 2x2x5 

=> 25 = 5x5 

=>15 = 3x5.

=>  LCM = 2^2x5^2x3=300. 

now let us divide   100000/300

=>333.333

=>now let us round of it to the next hundered

=>334

=>now,

=>334×300,

=>100200

hence 100200 is the 
the least number of six digits which is exactly divisble by 15,20 and 25

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hope it helps u..