Question

12a² - a -63 4a +9
Quien me puede ayudar con esto la. Respuesta con procedimiento porfas porfasss

Answer 1

Answer:

Points to remember 1. If A can finish a piece of work in `n' days, then A's 1 day's work is 1 n . 2. If the number of men engaged to do a piece of work is changed in the ratio a:b, the time required for the work will be changed in the ratio b:a 3. If A is X times as good a workman as B, then A will take 1 x of the time that B takes to do a certain work. 4. If M1 persons can do `W1 ' works in D1 days for T1 hours and M2 persons can do `W2 ' works in D2 days for T2 hours then M1 D1 T1 W2 = M2 D2 T2 W1 . 5. If A can finish a work in `x' days and B can finish the same work in `y' days, then time taken by both to finish the work is x x y y days 6. If A and B together can do a piece of work in xdays and A alone can do it in y days then B alone can do it in xy xy  days 7. If A, B and C can do a work in x,y, and z days respectively, then all of them working together can finish the work in x x yz y yz xz  days 8. If two taps A and B take a and b hours resepectively to fill a tank, then the two taps together fill 1 a 1 b  part of the tank in an hour and the entire tank is filled in   1 1 2 1   b ab a b( ) hours. Solved Examples: 1. 8 boys can arrange all the books of school library in 12 days. In how many days can 6 boys arrange them? Ans: M1 D1 = M2 D2  D x 2 8 12 6 = 16 days 2. A can do a piece of work in 12 days and B alone can do it in 15 days. How much time will both take to finish the work? Ans: A's 1 day's work = 1 12 B's 1 day's work = 1 15 (A+B)'s 1 day's work = 1 12 1 15 3 20    Both together can finish the work in 20 3 6 2 3 or days Using formula : Time taken to finish the work = x x y y x    12 15 12 15 = 12 15 27 20 3 6 2 3 x or days 3. A and B together can do a piece of work in 12 days. B alone can finish it in 30 days. In TimeandWork