Question

a man spend 1/4th, 1/5th and1/10th of his salary on education,food and transport .if he saves 1800 per month find his salary

Answer 1

let his salary be x
first we find the lcm which is 20,
salary spent on education=1/4=1/4*5/5=5/20 
salary spent on food=1/5=1/5*4/4=4/20
salary spent on transport=1/10=1/10*2/2=2/20
total salary=x
salary spent=5/20+4/20+2/20
salary spent=11x/20
salary saved=9x/20=1800$
9x/20=1800
9x=36000$
x=36000/9
x=4000$
his total salary=4000$
education=1000$
food=800$
transport=400$
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