1. Aakash earns Rs 20000 in 10 days. How much will she earn in 30 days ?
2. The weight of 72 books is 144 kg. What is the weight of 10 such books ?
3. If there are two lengths such that a = 90 cm and b = 120 cm, then find the ratio between them.
4. A student has 12 notebooks and 8 text books. Find the ratio of the notebooks to text books.
Answers
1) In 30 days she will earn Rs 60000.
2) The weight of 10 books is 20 kg.
3)The ratio of the lengths is 3:4.
4) The ratio of the notebooks and the text books is 3:2.
Explanation:
1) In 10 days she earns Rs 20000
∴ In 1 day she earns = Rs (20000/10)
= Rs 2000
∴ In 30 days she earns = Rs (2000×30)
= Rs 60000
∴ In 30 days she earns Rs 60000.
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2) The weight of 72 books is 144 kg
∴ The weight of 1 book is = (144/72) kg
∴ The weight of 10 books is = (144×10/72) kg
= (16×10/8) kg
= (2×10) kg
= 20 kg
∴ The weight of 10 books is 20 kg.
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3) It is given that,
One of the length = 90 cm
The other length = 120 cm
∴ The ratio of the lengths_
90:120
= 90/120
= 9/12 [dividing both the sides by 10]
= 3/4 [ dividing both the sides by 3]
= 3: 4 [ratio has no unit]
∴ The ratio of the lengths is 3:4.
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4) It is stated that,
The number of notebooks = 12
The number of textbooks = 8
Hence, the ratio of the number of the text books with the number of the notebooks _
12:8
= 12/8
= 3/2 [dividing both the sides by 4]
= 3:2[ratio has no unit.]
∴ The ratio is 3:2
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