Question
A person buys books at Rs. 300 for 5 and sells them at
Rs.740. How many books must he sell in order to earn profit of Rs. 3,520?Solution
C.P. of 5 books = Rs.300 S.P. of 5 books = Rs. 740 ∴ Profit earned by selling 5 books = Rs. 440 Rs. 440 is earned by selling 5 books. ∴ Rs.3, 520 will be earned by selling 
 = 40 books.
The HCF of two numbers is 9. Which of the following can never be their LCM?
Three numbers are in the ratio 7:5:4 respectively. If the HCF of the numbers is 3, then find the LCM of the numbers.
The HCF of two numbers is 14. Which of the following can never be their LCM?
The ratio of two numbers is 10:12 and their LCM is 240. The numbers are:
The HCF of two numbers is 21. Which of the following can never be their LCM?
The HCF and LCM of two numbers, A and B, are 9 and 162, respectively. The difference between these two numbers is 27. Find their sum.
The least number which when divided by 10, 12, 15 and 20 leave zero remainder in each case and when divided by 24 leaves a remainder of 12 is:
Three numbers a, b and c are co-prime to each other such that ab = 221 and bc = 247. Find the value of (a + b + c).
The least number which when divided by 5, 15 and 25 leave a same remainder 2 in each case?Â
Let N be the greatest number that will divide 85, 116, 147 leaving the same remainder in each case. Then sum of the digits in N is:
