Question
‘D’ and ‘E’ together can finish a task in 40
days, while ‘E’ and ‘F’ together can finish the same task in 30 days. ‘D’ and ‘E’ together worked on it for 35 days and then ‘F’ alone completed the remaining work in 10 days. If ‘D’, ‘E’, and ‘F’ started a certain task and worked together till its completion for which they received Rs. 1800 as total wage, then the share of ‘D’ out of the total wage will be:Solution
Let the total amount of work = LCM of 40 and 30 = 120 units Work done by ‘D’ and ‘E’ in one day = 120/40 = 3 units Work done by ‘E’ and ‘F’ in one day = 120/30 = 4 units Work done by ‘D’ and ‘E’ in 35 days = 35 × 3 = 105 units Remaining work = 120 - 105 = 15 units Efficiency of ‘F’ = 15/10 = 1.5 units per day Efficiency of ‘E’ = 4 - 1.5 = 2.5 units per day Efficiency of ‘D’ = 3 – 2.5 = 0.5 units per day Share of ‘D’ = (0.5 / (0.5 + 2.5 + 1.5)) × 1800 = Rs 200
Which lens is used to correct myopia (shortsightedness)?
What is the SI unit of power?
Which law is violated if two bodies in mutual gravitational interaction exert unequal forces on each other?
Ultra violet radiations of the Sun do not reach the earth because, earth's atmosphere is surrounded by –
Gamma rays have greatest similarity with –
Two cities are 125 km apart. Electric power is sent from one city to another city through copper wires. The fall of potential per km is 9.6 volt and the...
The refractive index of glass is 1.5. What is the speed of light in glass?
(Speed of light in vacuum is 3.0 ×108 m s-1)
What does Ohm's Law state?
For a projectile, maximum range is obtained when angle of projection is:
A transistor works as an amplifier only when:
