allery20 boys average 15 years and 30 girls average 20 years. What is the average age of all 50?
A18 years
B17.5 years
C17 years
D18.5 years
Answer & Solution
Correct answer: A. 18 years
Total age is 300 + 600 = 900 years for 50 children, so 18 years.
Keep practising Mixture and Alligation
Browse all Mixture and Alligation questions for SSC CGL, or explore more Quantitative Aptitude topics.
Related questions
A 40 L vessel of pure milk has 10 L removed and replaced by water. What is the milk to watHow much water is in 50 L of a milk and water mixture where milk to water is 7:3?A 24 L mixture has milk and water in the ratio 5:3. How much milk is in it?A seller mixes water with milk costing Rs 30/L and sells at Rs 30/L. If 1 L of a 5 L mix i30 students average 40 marks and another 20 average 65 marks. Find the combined average.Boys average 60 kg and girls 50 kg; the class average is 56 kg. What is the boys to girls How much flour at Rs 8/kg must be mixed with 30 kg at Rs 14/kg to get a blend at Rs 12/kg?Oil at Rs 120/L and Rs 160/L is mixed in the ratio 2:3. Find the price of the mixture per