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The answer is (c) 30 days. Solution: Let, Time taken by B = x days Then, time taken by A = (x-6) days According to the question, => (1/x) + (1/(x-10)) = 1/12 = ((x-10)(x))/(x² - 10x) = 1/12 [Taking LCM] = 2x -10 / x² - 10x = 1/12 = 12(2x - 10) = x² - 10x = 24x - 120 = x² - 10x = x² - 34x + 120 = 0 = x² -30x -4x + 120 = 0 = x(x-30) - 4(x-30) = 0 = (x-30) (x-4) = 0 Therefore, x = 30 or x=4 But, Time taken by A = x-10 = 4-10= -6 But time cannot be negative, thus, x=4 must be rejected. Therefore, now, x=30= no. of days taken by B to complete the work. Thus, the answer is (C) 0 days
Answer of Homework questions is option C)30 days There are 2 values of x ,,one is 4 and second is 30 but 4 will be rejected ,, therefore we left with 30
Option D Let the time taken by B be x days Therefore, time taken by A = x-10 days Now, A's work done in one day = 1/x-10 - (i) Also, B's work done in one day = 1/x- (ii) So, work done by both of them in one day = 1/12 - (iii) Therefore, by eq (i),(ii) and (iii) 1/x + 1/x-10 = 1/12 or, x-10+x/x² - 10x =1/12 or, 2x-10/x² - 10x = 1/12 or , 24x - 120 = x² - 10x or, x² - 34x + 120 = 0 or, x² -30x -4x + 120 = 0 or, x(x-30) -4(x-30) = 0 or, (x-4) (x-30) =0 or, x = 4 0r 30 But if we'll take x = 4 ,the time taken by A becomes -ve. Therefore, x = 30. So, time taken by B is 30 days. If you feel this helpful Like here👍👍👍
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BYJU'S TEAM PLEASE MAKE A VIDEO ON PROBABILITY TOPIC ON LEAP YEAR PROBLEMS
Yes bro
It is इसि
Time saver
3:53
Homework answer: 30 days (c)
Ans 1
X=70
Y=140
HW:-
Equation - x^2 - 34x + 120 = 0
Ans - (C) 30 days
The answer is (c) 30 days.
Solution:
Let,
Time taken by B = x days
Then, time taken by A = (x-6) days
According to the question,
=> (1/x) + (1/(x-10)) = 1/12
= ((x-10)(x))/(x² - 10x) = 1/12 [Taking LCM]
= 2x -10 / x² - 10x = 1/12
= 12(2x - 10) = x² - 10x
= 24x - 120 = x² - 10x
= x² - 34x + 120 = 0
= x² -30x -4x + 120 = 0
= x(x-30) - 4(x-30) = 0
= (x-30) (x-4) = 0
Therefore, x = 30 or x=4
But,
Time taken by A = x-10 = 4-10= -6
But time cannot be negative, thus, x=4 must be rejected.
Therefore, now, x=30= no. of days taken by B to complete the work.
Thus, the answer is (C) 0 days
Answer of Homework questions is option C)30 days
There are 2 values of x ,,one is 4 and second is 30 but 4 will be rejected ,, therefore we left with 30
The video is too good
It's so helpful❤❤
Homework question:-
A- 20 days
B-30 days
Homework question
Solution = option c
B takes 30 days to finish the work
Best explanation till date!!!
The homework question answer is (C) 30 ,since -4 could not be work done
Mam HW qp answer is 30 days 🥳
Ma'am can u please bring how to tackle questions on quadratic equation chapter topic problems on money matters ?? Plssss
L***a le**
**** lele
Option D
Let the time taken by B be x days
Therefore, time taken by A = x-10 days
Now, A's work done in one day = 1/x-10 - (i)
Also, B's work done in one day = 1/x- (ii)
So, work done by both of them in one day = 1/12 - (iii)
Therefore, by eq (i),(ii) and (iii)
1/x + 1/x-10 = 1/12
or, x-10+x/x² - 10x =1/12
or, 2x-10/x² - 10x = 1/12
or , 24x - 120 = x² - 10x
or, x² - 34x + 120 = 0
or, x² -30x -4x + 120 = 0
or, x(x-30) -4(x-30) = 0
or, (x-4) (x-30) =0
or, x = 4 0r 30
But if we'll take x = 4 ,the time taken by A becomes -ve.
Therefore, x = 30.
So, time taken by B is 30 days.
If you feel this helpful
Like here👍👍👍
Thank you mam you teach which is very useful to us problem solved
Thank you so much mam . You explained really well
HW:
Time taken by B to finish the work is 30days ❤
Thank you so much ma'am you re helping me to tackle such questions
Ya if you solve like this in exam then you'd be able to solve only 2-3 questions 🤣
Mam. Volumes aur surface area ki bhi word problem
Mam please make a video on linear equation?
Option : C is correct 💯
HOMEWORK QUESTION : TIME TAKEN BY B= 30 DAYS OPTION (D).
THANKS A LOT MAM FOR SUCH HELPFUL SESSIONS. THANKS MAM.
Bro voh options d) nahi c) hai dekho pehlee
Answer. Is (c)
Good❤❤❤
Mam you are best best over highest best no words.
Mam in q2 why not x+y=4
thanks mam 🥰🥰🥰🥰
Thankyou mam very very thankyou
C = 30 days
Homework question answer c
Starts at 4:00
Mam this is cancelled right now for cbse because it was not therein syllabus
Sachi me?
20:00 😢😢🎉
good explanation
HALWA SESSION THANKU MAM
Answer of the home work question is 30 days
nice explaination
Option (D) 30 days is the correct answer
HOMEWORK QUESTION
(C)30 days
bhai madam apne to bohot acha khatarnak aur op samjhaya systum break kr diya maam apne to
30!
The right answer of the H.W is 30 days..
Option c
Homework answer: 30 days.
Ans for hw que is 30days
Thank You x infinite...
Thankyou mam
Ans :( c )30 days
x=30 days as x=4 is not possible and x-9= 20 days
Jay mahakal 🎉🎉
Option C, 30days
Option c 30 days
🎉
Homework x=30 days
30
B can finish the work in 30 days
Mam can you make a video on profit and loss topic of chapter 3 and 4.
Hello Ranjni, We will definitely come up with such session for you👍🏻
Ok mam
Thanks
Ans= 30 days
Ma'am three se into kyu karna hai😯
Aur four se bi kyu into kar rahe hai
Eliminate krne ke liye
30 day homework questions answers
Hi mam
H.w question answer:
time taken by A=20
Time taken by B=30
Hi madam
(c) 30 days
B=30
Could you pls use English, mam?
thankyouuu so much..!!!!!
Ok
C) 30 DAYS
30 days
30days
me bas padhna hu 😊.
30 day's
30 days hoi madam
30 ans
Please make video on pipe and tank related questions
Option D
HW
Option C 30 days
Option C 30 days
Ans=30days
30 days
30days
Thank u mam
Option c
30 days