Question
A candidate just passed by getting 100 answers correct
by attempting 200 of the total questions. Find the total number of questions in the examination if a candidate needs 40% marks. (All questions carry equal marks)Solution
Let the total number of questions be x. then, Percentage need in exam = 40% Correct answer = 100 percentage = (correct answer)/(total questions) 
100 40 = 100 x = 250 Alternate method Given that 100 ≡ 40% 1 ≡ % 250 ≡ 100% total number of questions = 250
What is the minimum number of square marbles required to tile a floor of length 4 metres 35cm and width 3 metres 60 cm? Â
The least number which when divided by 7, 12, 15 and 20 leave zero remainder in each case and when divided by 26 leaves a remainder of 4 is:
Find the least number which when divided separately by 15, 20, 35 and 45 leaves 3 as remainder in each case?
What is the HCF of 4/5, 6/8, 8/25 ?
The maximum number of students among whom 891 pens and 810 pencils can be distributed in such a way that each student gets same number of pens and same ...
Find the smallest number which when divided by 3, 4, 5 and 6 gives remainder ‘2’ in each case?
What is the least number which when divided by 4, 6 & 8 leave a remainder 6 in each case & it is also divisible by 5?
Two numbers are in the ratio 5:7. The product of their H.C.F. and L.C.M. is 5040. The sum of the numbers is:
The sum of HCF and LCM of two numbers is 450. If the LCM is 14 times the HCF, and one number is 42, what is the second number?
