Question
The average height of each student in a class of 15
students is 160 cm. If 6 new students joined the class, then the average height of the each student in the class increases by 4 cm. Find the average height of 6 new students who joined the class.Solution
Total height of 15 students of the class = 160 × 15 = 2400 cm When 6 new students joined the class, average height of each student = 160 + 4 = 164 cm Total height of 31 students of the class = 164 × 31 = 3444 cm Average height of 6 new students who joined the class = {(3444 – 2400)/6} = 1044/6 = 174 cm
X can do a piece of work in 36 days. He worked at it for 6 days and then Y finished it in 20 days. In how many days can X and Y together finish the work...
‘A’ alone can complete a work in 20 hours. ‘A’ started the work alone and left after working on it for 15 hours. If ‘B’ completed the rest o...
Rohan can finish a task alone in 24 days. Shreya can do 50% of the same task alone in 12 days. If Shreya and Tanya work together, they can complete 60% ...
Find the value of "w" if Armaan can complete a Sales target in (w + 20) days, Malik can complete it in (w + 44) days, and when they work together, they ...
A can do a job in 24 days, while B can do the same job in 30 days. They started the work together, but A left after 6 days. In how many more days will B...
Ankit and Priya together can complete a piece of work in 200 days and 10 minutes, while Priya and Vikas together can complete the same work in 130 days ...
"Arnav, Bhanu, and Chinu can finish a task in 18 days, 24 days, and 30 days, respectively. They all begin working together, but B...
A completes 37.5% of a task in 9 days, B finishes 44.44% of the same task in 8 days, and C accomplishes 66.67% in 8 days. How many days will it take for...
A 480-liter blend contains soap and water in a 5:3 ratio. Adding 60 liters of soap and (6u + 30) liters of water changes the ratio to 6:5. Find the rati...
P and Q together can do a piece of work in 15 days, Q and R together can do it in 18 days. P starts the work and works on it for 5 days, then Q takes it...
Relevant for Exams:
