Mary is thrice as old as Lisa and Ian is 60 months older than Mary. If the sum of ages of Mary, Lisa, and Ian is 63 years and 4 months, then what is Mary's age?

If the price of a particular chemical is $15 per 650 centigrams, then what will be the approximate price of 1560 carats of that chemical?

Daniel borrowed a certain amount of money from a bank at a quarterly rate of 2.5% for 4 years. If the interest paid by him after 4 years is $624 then what is the value of principal amount?

174 miles= ______________ kilometers