Question
Deepak and Deepti with each other can complete a work in
60 days, Deepti and Danny in 90 days and Deepak and Danny in 90 days. In how many days can Deepak, Deepti and Danny can complete the work if they work individually alone?Solution
ATQ, We can say that let no of days taken by Deepak, Deepti and Danny when they work alone be taken as - x, y and z days individually. (1/x) + (1/y) = (1/60)..........eq(1) (1/y) + (1/z) = (1/90)...........eq(2) (1/x) + (1/z) = (1/90)............eq(3) While adding eq(1),(2) and (3) we get (2/x) + (2/y) + (2/z) = (1/60) + (1/90) + (1/90) = 2((1/x) + (1/y) + (1/z)) (3 + 2 + 2)/180 = (1/x) + (1/y) + (1/z) = (7/360)......eq(4) Now Subtract eq(4) with - eq 1, eq 2 and eq 3. eq(4) - (1) = (1/z) = (7/360) - (1/60) = (1/360) eq(4) - (2) = (1/x) = (7/360) - (1/90) = (1/120) eq(4) - (3) = (1/y) = (7/360) - (1/90) = (1/120) Therefore, no of days taken by Deepak, Deepti and Danny are 120,120 and 360 days individually.
 The level of heterosis is generally ……………… in cross pollinated species and ……………… in self-pollinated species
...When pollen from a flower of one plant falls on the stigmas of other flowers of the same plant, as in Maize is known as
………………………………. provides maximum opportunity for the breeder to use his skills for selection of desirable plants from segregating ...
A method of asexual propagation in which a stem is made to produce roots while still attached to the parent plant is called
Almost all gymnosperms are generally ……………………. In nature
In Bulk breeding method, individual plant selection is done after population attains ……………….
...In a specific flowering plant, the pink flower color is not due to a Mendelian single-gene interaction but rather appears to be due to multiple genes ac...
During anaphase, the significance of sister chromatids separating and moving towards opposite poles is?
The term given to the ability of single cell to divide and produce all the differentiated cell in the organism.
______________ is a form of asexual reproduction in plants where seeds are produced without the involvement of meiosis or fertilization. In this process...
Relevant for Exams:
