Question

Rohan and Amit can build a tank in 12 days while
Amit and Sohan in 15 days, and Rohan and Sohan
in 20 days. How long would each take to do the
same work?

mathematics
Step by step explanation pls ASAP
grade 8
the answer should be:
Rohan= 30
Sohan= 60
Amit= 20
​

Answer 1

Step-by-step explanation:

Rohan and Amit can build a tank in 12 days

Rohan and Amit 1 days work = 1/12-----> i

Amit and Sohan in 15 days,

Amit and Sohan 1 days work= 1/15---> ii

Rohan and Sohan in 20 days

Rohan and Sohan 1 days = 1/20 --------> iii

I+ii+iii

2 (amith, rohan sohan 1 day work) = 1/12 + 1/15 + 1/20

2(amith, rohan sohan 1 day work) = (5+4+3)/60

2(amith, rohan sohan 1 day work) = (12)/60

amith, rohan sohan 1 day work = 1/10-----iv

iv-i

sohan 1 day work= 1/10-1-12=(6-5)/60=1/60

Sohan only can finish in 60 days

iv -ii

rohan 1days work=1/10-1/15=(3-2) /30=1/30

Rohan can finish in 30days

iv - iii

amith 1 day work= 1/10-1/20=(2-1) /20=1/20

Amith can finish in 20 days

Answer 2

Answer:

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