The average age of three boys is 18 years and their age ratio is 2: 3: 4, then what is the age of the youngest boy?

Ram started a business with a sum of Rs 600. After 3 months Shyam and after 6 months Mohan also become partners. If the profit at the end of the year was divided in the ratio of 4: 5: 3, then how much was Shyam's capital more than Mohan's capital.

In how many years will Rs 2000 become Rs 2420 at 10 percent compound annual interest?

Which amount will be Rs 520 in 5 years with simple interest and Rs 568 in 7 years?

If $$ {x+{1\over x}=7}$$ then $$ {x^{2}+{1\over {x^{2}}}=?}$$

If $$ {\sqrt{2x+9}+x=13}$$ then find the value of x?

A furniture salesman increased the value of furniture by 20 percent due to the lure of more income, which led to a decrease of 30 percent in his sales, then tell him what percentage was reduced in his income?

The weight of a bucket full of water is 36 kg. If the weight of a half-filled bucket is 21 kg, what will be the weight of the empty bucket?