Question
A’ and ‘B’ alone can do a certain work in 20 days
and 30 days, respectively. Both started the work together but after ‘x’ days ‘A’ left the work and the rest work was completed by B alone in ‘2x’ days. Find the total time taken to complete the whole work in this way.Solution
Total work = 60 units (LCM of 20 and 30) Efficiency of ‘A’ = 60/20 = 3 units/day Efficiency of ‘B’ = 60/30 = 2 units/day According to the question, ‘A’ worked for ‘x’ days and ‘B’ worked for ‘2x days. Therefore, 3x + 2 × 2x = 120 Or 3x + 4x = 60 Or x = 60/7days total time taken to complete the whole work = 2×60/7=120/7days
Select the set in which the numbers are related in the same way as are the numbers of the following sets. (NOTE: Operations should be performed on the w...
The sequence of folding a piece of paper and the manner in which the folded paper is cut is shown in the following figures. How would this paper look wh...
A, B, C, D, E and F live on six different floors of the same building. The lowermost floor in the building is numbered 1, the floor above it, number 2 a...
If a mirror is placed on the shaded line, which of the following options is the correct image of the given shape?
Three of the following four letter-clusters are alike in a certain way and one is different.
Pick the odd one out.
Select the Venn diagram that best illustrates the relationship between the following classes.
Animals, Lizards, Octopuses
In a code language, 'PARUL' is coded as RDTXN and 'MADHU' is coded as ODFKW. How will 'VIJAY' be coded in the same language?
If in a code language PRIME is written as KIRNV, then SPORT would be written as ______ in the same language.
In a certain code language, 'he loves children' is written as 'AA CC PP', 'children like candles’ is written as ‘ZZ PP QQ’ and ‘she loves candie...
Relevant for Exams:
