Question
A boy goes to school at 9 km/Hr and return at a speed of
8 km/hr. If he takes 17 hrs in all. Find the distance from his village to school?Solution
Let the distance from village to school be D km According to the question, ⇒ D/9 + D/8 = 17 ⇒ 17D/72 = 17 ⇒ D = 72 km
Three numbers are in the ratio 5:3:2 respectively. If the HCF of the numbers is 4, then find the LCM of the numbers.
What is the HCF of  (x4  - x2  - 6)   and  (x4  - 4x2  + 3) ?
(a)Â x2 Â - 3Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â (b)...
Find the greatest number that will divide 420, 525 and 300 without leaving a remainder.
If total number of factors of 6,615 is 'x', then find the value of (x - 2)(x + 4).
Let x be the smallest number which when subtracted from 31560 makes the resulting number divisible by 13, 16, 25 and 30. The product of the digits of x ...
The product of two numbers is 4950 and their L.C.M is 225. What is the H.C.F of the two numbers?
Three numbers a, b and c are co-prime to each other such that ab = 78 and bc = 65. Find the value of (a + b + c).
The least number which when divided by 8, 12, 16 and 18 leave zero remainder in each case and when divided by 22 leaves a remainder of 12 is:
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