Mathematical Challenge!

Please write solution for my question:

Arun invested 4500 rupees, Ram invested 90000 after 3 months, Raj invested 60000 after 6 months in the same business. They got 20000 rupees profit after 1 year. What would be Raj's share in it?

I shall appreciate a quick response

My mail id is

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The smallest number which when diminished by 3 is divisible by 21,28,36 and 45 is...
by: Anonymous

The required number = l.c.m. of (21,28,36 ,45)+3 =
l.c.m. of (21,28,36 ,45)=3x7x3x4x5=1260+3=1263

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