Question
If A, B and C can do a work in 6 days, 9 days and 11
days, respectively, then, working together, how many days will they take to do the work?Solution
ATQ,
A's work rate: A completes the work in 6 days, so A does 1/6 of the work in 1 day. B's work rate: B completes the work in 9 days, so B does 1/9 of the work in 1 day. C's work rate: C completes the work in 11 days, so C does 11/11 of the work in 1 day. Combined work rate: Together, they complete: 
Find the combined rate : 
Time to complete the work : To complete 1 full work, the time taken is: 
 = or 2(52/73) days
Two cones X and Y of are melted together to form a cylinder of height 48 m. The height of cones X and Y are in the ratio of 3:2 respectively and the rad...
Find the total surface area of a right circular cylinder with radius 7 cm and height 10 cm. (Take π = 22/7)
Find the cost of building a fence around a square field with area 529m2 at the rate of Rs.40 per meter ?
A stone is thrown vertically with the velocity which would just carry it to height of 100 feet. Two seconds later another stone is projected vertically ...
The cost of fencing a rectangular field at the rate of Rs. 5/metre is Rs. 330. If the length of the field is 11 metres more than its breadth, then find ...
Perimeter of a square shaped plot is 80 metres and the area of a rectangular plot is 38% more than that of the square shaped plot. Find the area (in m
Find out the volume of a tetrahedron whose side is 6√2 cm³ ?
Find how many cubes of side 1 cm each can be made by melting a cuboid with dimensions 20cm × 40cm × 5cm?
The perimeter of a rectangle is given as 72 cm, and the side of a square is equal to the mean of the length and breadth of the re...
Relevant for Exams:
