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Start learning 50% faster. Sign in nowTotal age of 20 girls = 20 × 54 = 1080 years If the age of two more girls is added the average decreases by half a year, ∴ Total age of 22 girls = 53.5 × 22 = 1177 Now, sum of the age of new girls = 1177 – 1080 = 97 years
Five bells commence tolling together and tolls at intervals of 6, 12, 36, 42 and 60 seconds respectively. In 126 minutes, how many times do they toll to...
Find the greatest number which when divide 80,121 & 148 leave remainder 2, 4 & 5 respectively?
The LCM of two numbers is 720. The HCF of these numbers is 12. If one of the numbers is 48, find the other number.
The least number which when divided by 3, 9, 27 and 81 leave remainder 2, 8, 26 and 80 respectively is?
Two numbers are in the ratio 3:7. The product of their H.C.F. and L.C.M. is 2541. The sum of the numbers is:
The L.C.M of a² – 2a – 3 and a³ + a² + a + 1 is
The least number which when divided by 5, 10, 12 and 15 leave zero remainder in each case and when divided by 18 leaves a remainder of 6 is:
The smallest number which when divided by 25 and 30 leaves remainder 10 and 15 respectively is: