Question

5) if 4/5 of a cistern is filled in 1 minute how much more time will be required to fill the rest of it..

PLEASE DO THE SUMS BY FOLLOWING THE "UNITARY METHOD"
AND NO WRONG ANSWERS​

Answer 1

Answer:

Step-by-step explanation:

ANSWER ---

Let the cistern fill fully in x minutes

In 1 minute ====== 4/5 cistern

In x minutes ====== 1 cistern

USING PROPORTIONALITY (UNITARY)METHOD,

1 : 4/5 :: x : 1

Product of means = Product of extremes

1 × 1 = 4/5 × x

1 = 4/5 of x

=> x = 5/4 minutes

1 minute = 60 seconds

=> 5/4 × 60

=> 75 seconds

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ANSWER = 75 seconds OR 1 minute 15 seconds

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