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Time and Work : Part 9 (in Hindi)
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Part 9

Abhishek Pandey is teaching live on Unacademy Plus

Abhishek Pandey
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A does 1/2 as much work as B and C does 1/2 as much work as A and B together. If C alone can finish the work in 40 days then together al Wil finish the work in how many days?
Abhishek Pandey
a year ago
C work in : 40 Days A + B work in : 20 Days 1 day work of A and B = 1/20 Ratio of one day work of A and B = 1:2 one day work of A = 1/20 * 1/3 = 1/60 = 60 days to complete the work. one day work of B = 1/20 * 2/3 = 1/30 = 30 days to complete the work A : 60 B : 30 C : 40 LCM = 120 One day work = 2 , 4 , 3 total time = 120 / 9 = 40/3 days
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Manishachauhan
a year ago
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Manishachauhan
a year ago
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Manishachauhan
a year ago
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Manishachauhan
a year ago
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Manishachauhan
a year ago
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Manishachauhan
a year ago
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Manishachauhan
a year ago
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Manishachauhan
a year ago
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Manishachauhan
a year ago
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Manishachauhan
a year ago
isme hum direct a and B ka one day work 1/20 Nikal le agr or fir complete work Ko 1 consider krke...or ABC ka one day work add krke 1 se divide kr de ? aise bhi kr skte hn kya?
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Manishachauhan
a year ago
sir mujhe smjh nhi aaya...A nd B together work in 20 days or ratio of one day work of A nd B 1:2 ?? ye do point nhi smjh aaye
Abhishek Pandey
a year ago
C 40 days me work karta hai C (A+B) ka half work krta hai C 40 days me krega to A+B 20 Days me krega
Abhishek Pandey
a year ago
aur first line me likha hai question me A half work krta hai B se one day work ka ratio = 1/2 : 1 or 1:2
Udit Singh
a year ago
where is this 1/3 & 2/3 came from
Udit Singh
a year ago
where is this 1/3 & 2/3 came from
Udit Singh
a year ago
help help help
if 4 goats and 6 sheeps can graze a field in50 days.2 goats and 9 sheeps can graze the field in how many days??
Abhishek Pandey
a year ago
iska answer 25 days aaega. tumne question me 4 goats and 9 sheep's likha hai uski jagah 4 goat or 9 sheep aaega
Mansirat Sandhu
a year ago
maine b to 4 goats or 9 sheeps e likha hai...apne v vhi kha
Mansirat Sandhu
a year ago
maine b to 4 goats or 9 sheeps e likha hai...apne v vhi kha
Mansirat Sandhu
a year ago
maine b to 4 goats or 9 sheeps e likha hai...apne v vhi kha
Mansirat Sandhu
a year ago
but question mein and hi hai
Mansirat Sandhu
a year ago
but question mein and hi hai
Mansirat Sandhu
a year ago
but question mein and hi hai
Mansirat Sandhu
a year ago
isko solve kaise krna hai
Abhishek Pandey
a year ago
question me and nahi aaega or aaega dono ka matlb alag alag hai
Abhishek Pandey
a year ago
Part of field grazed by 4 goats in 1 day = 1/50  Part of field grazed by 1 goat in 1 day = (1/50) x 4 = 1/200  ⇒ 4 g = 6 s [here, g = goats, and s = sheep] ⇒ 1 s = (4/6) g = (2/3) g  Now, 2 g + 9 s = 2 g + 9 x (2/3) g = 2 g + 6 g = 8 g  ∴ 8 goats can graze the field in (1/8) / 200 = 25 days
Mansirat Sandhu
a year ago
thnk u very much
Sir in 3rd question of type 9, they asked extra days... and 10 includes days from 27th day to 31st day, which has already included. so to find extra days we need to substract that 4 days?
Abhishek Pandey
a year ago
no extra days are x we have to find that value of x
Mayank jain
a year ago
Means we have to find days after 27th day?
Mayank jain
a year ago
Means we have to find days after 27th day?
Abhishek Pandey
a year ago
yes
In type 6, how can decide whether we have to assume 100 or 'x'? like for question no. 1-4 you have assumed 100 and for question 5 you assumed it to be 'x'. Can you please explain.
Abhishek Pandey
a year ago
whenever they will give time difference assume x otherwise 100.
In case we take it as b=100, how to solve?
Abhishek Pandey
a year ago
solve this questions as x because this 100 will create lot of confusion.
ok sir! thankyou!
A+B=18 B+C=24 A+C=36 In how many days B alone can finish the work??
Abhishek Pandey
a year ago
total work = 72 by same method one day work : A+B = 4 B+C = 3 A + C = 2 add these equations = 2(A+B+C) = 9 A+B+C = 4.5 subtract equation 3 B = 4.5 - 2 = 2.5 (one day work) total day = 72/2.5 = 144/5 day
1998 Nonu
a year ago
Why 2(a+b+c)??
1998 Nonu
a year ago
Got it! Thankyou very much sir!
1998 Nonu
a year ago
Sir can you please elaborate again
Abhishek Pandey
a year ago
just read the solution once again because A B C 2 baar likha hua hai islie 2(A+B+C) aaega. baki sab same method se krna hai.
1998 Nonu
a year ago
Par 72/2.5 =144/5 how?
Abhishek Pandey
a year ago
72/2.5 point hata do = 720/25 5 se cut kr do = 144/5
1998 Nonu
a year ago
Okk
1998 Nonu
a year ago
Thankyou sir
Abhishek Pandey
a year ago
:)
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