Question

1)What is Dina's walking rate in miles per hour if she walks 3 /4 mile in 1 / 4 hour?


2) A window washer spends 6 minutes for cleaning 8 windows. How long will it take him to clean 28 windows?

3) Find the number of pieces of ribbon if a ribbon of length 21 /4 m is cut into small pieces of length 3/ 4 m.

4) Kajol has Rs.75. This is three-eighths of the amount she earned. How much did she earn?


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Answer 1

Answer:

Answer 1:

since Dina can in 1/4 hours=3/4 Miles

so Dina can walk in 1 hours=(3/4)/(1/4)

on solving=3 Miles

so Dina's waking rate is 3 Miles per hour

Answer 2

Answer:

1)  3/4 = 1/4

    3/4 divided by 1/4

    3/4 x 4/1

    3 miles

2) 6 mins = 8 windows

    All things being equal, that should be 21 minutes.

Looking at proportion,

If it takes 6 mins for 8 windows

It will take x mins for 28 windows

So,

6 = 8

x =  28

Cross multiply,

x=(6×28)÷8

x=21 minutes

3) 21/4 divided by 3/4 will give the answer,

   21/4 x 4/3

   7 pieces

4) Rs 75 = 3/8 of amount earned

   75/1 divided by 3/8

   75/1 x 8/3

   Rs 200

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