Question
In an examination, the average marks obtained by the
students is 75. After correcting the quantitative mistakes, the average of 100 students is reduced to 60 from 75 and the overall average of the student is reduced to 70. Then find the total number of students who participated in that examination.Solution
Let the total number of students be x Average marks obtained by the students = 75 Total marks = 75 x After correcting the quantitative mistakes the average decreased by (75-60) = 15 marks Total reduction = 15 × 100 = 1500 Now According to the Question, (75x-1500)/x = 70 70 x = 75 x – 1500 x = 300 Total number of students = 300
LCM and HCF of two numbers are respectively 3 and 18. If one of them is 9, find the other number.
The HCF of 6453 and 7122 is 325, their LCM is:
The greatest number, which when subtracted from 7452, gives a number exactly divisible by each of 20, 27, 30 and 32, is:
What is the difference between the LCM and HCF of 36, 40?
The LCM and the HCF of the numbers 30 and 45 are in the ratio:
- The product of two numbers is 4950 and their L.C.M is 225. What is the H.C.F of the two numbers?
Find the HCF of 932 and 748.
Find the least number of equal sizes square tiles which can be fitted in a rectangular room whose sides are 360 m and 480 m?
- If the product of two numbers is 144 and their HCF is 6, then find the LCM of the given two numbers.
- The product of two numbers is 4620 and their L.C.M is 210. What is the H.C.F of the two numbers?
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