Question

Madhuri's heart beats 360 times in 5 minutes. About how many times does it
beat in half an hour?

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Answer 1

Answer:

2160

Step-by-step explanation:

=> 5 minutes = 360 times

=> let 30 minutes = x

now,

      as it is directly proportional so,  

   =>   times:mintes::times::minutes

   => 360:5::x:30

   => 360/5=x/30

       by cross multiplication,

    =>360*30=5x

    =>360*30/5=x

    =>x=2160

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