Question

A typist can type 350 words in 7min. How many words can she type in 1 hr and half

Answer 1

Answer:

Step-by-step explanation:

A typist types 350 words in 7 minutes

in 1 minute he types 350/7 = 50 words

in 60 minutes he types  50x60 = 3000 words

She can type 3000 words in one hour.

Answer 2

Answer:

She can type 4500 words in 1 hour and half.

Step-by-step explanation:

Given,a typist can type 350 words in 7 min.

Now we want to find how many words can she type in 1 hour and half

We know 1 hour and half means 90 minutes.

We can solve this problem by Unitary method.

But what is the use of Unitary method.

By one example we can understand this concept easily.

If cost of 1 apple is 10 rupees

then by Unitary method,cost of 5 apples will be (5×10) = 50 rupees

Here In 7 minutes she can type 350 words.

By Unitary method, in 1 minute she can type $\frac{350}{7}$

words.

And in 90 minutes she can type

$\frac{350}{7} \times 90 \\ = 50 \times 90 \\ = 4500 \: words$

Know more about Unitary method,

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