Question

4. A man earns 18000 in 3 months.
(i) How much time would he take to earn 30000?
(ii) How much money will he earn in 7 months?​

Answer 1

Money Earned in 3 month=18000

" " 1 month=18000÷3=6000

(i) Time Taken to earn 30000=30000÷6000=5 months

ii)Money earned in 7 months=6000×7=42000

Answer 2

Answer:

A man earns Rs. 18000 in 3 months. ∴ It would take 5 months to earn Rs. 30000.

Step-by-step explanation:

We can use the unitary method.  

A man earns Rs. 18000 in 3 months.  

∵Time taken by the man to earn Rs. 18000 = 3 months

∴Time taken by the man to earn Rs. 1 =  months =  months

∴Time taken by the man to earn Rs. 30000 =  months =  months =  months = 5 months

∴ It would take 5 months to earn Rs. 30000.  

I am going to show you another method using ratio and proportion.  

The question says that a man earns Rs. 18000 in 3 months.  

Let the time taken by the man to earn Rs. 30000 be  months.  

The units are Rs. and months. There are same units for money and same units for months.  

Now,  

18000 : 30000 : : 3 :  

Solve for .  

Cross multiply.  

∴ It would take 5 months for the man to earn Rs. 30000.  

If you have done ratio and proportion, you will find this method easier.  

I have shown both the methods. You can try any one method which you will find easier.  

Hope this may help you.