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Rakesh Yadav Class Notes Arithmetic Bilingual 2nd Edition

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Weight : GM
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Publisher : Rakesh Yadav Readers Publications
Seller : Amit Singh
Authors : Rakesh Yadav

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Q1

A man buys a watch for ₹1200 and sells at 25% profit. Find selling price.

A1

Profit = 25% of 1200 = ₹300. Selling price = 1200 + 300 = ₹1500.
Q2

If compound interest on ₹5000 at 10% p.a. for 2 years is?

A2

Amount = 5000(1.1)² = ₹6050. CI = 6050 − 5000 = ₹1050.
Q3

A and B invest ₹3000 and ₹5000. Annual profit ₹1600. Find B’s share.

A3

Ratio 3:5. B’s share = (5/8)×1600 = ₹1000.
Q4

Average of 5 numbers is 20. If one number 30 is removed, new average?

A4

Sum of 5 = 100. Remove 30 → sum 70 for 4 numbers. New average = 70/4 = 17.5.
Q5

10 men complete a work in 6 days. 12 men will take how many days?

A5

Men × days constant: 10×6 = 12×D ⇒ D = 60/12 = 5 days.
Q6

In a 1000 m race, A beats B by 100 m. Ratio of speeds?

A6

When A runs 1000 m, B runs 900 m. Speed ratio A:B = 1000:900 = 10:9.
Q7

Mixture of 40L milk & water has 20% water. How much water to add to make 30% water?

A7

Milk = 32L (constant). New mixture = 32/0.7 ≈ 45.71L. Water added = 5.71L.
Q8

Selling price ₹540 after 10% discount on marked price. Find marked price.

A8

Discounted price = 90% of MP = 540 ⇒ MP = 540/0.9 = ₹600.
Q9

At what rate of simple interest will ₹800 become ₹1000 in 4 years?

A9

SI = ₹200. SI = P×R×T/100 ⇒ 200 = (800×R×4)/100 ⇒ R = 6.25% p.a.
Q10

In a pie chart, a sector of 72° represents ₹20,000. Total value?

A10

72°/360° = 1/5 fraction. Total = 20,000 × 5 = ₹1,00,000.

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Have Doubts Regarding This Product ? Ask Your Question

Q1

A man buys a watch for ₹1200 and sells at 25% profit. Find selling price.

A1

Profit = 25% of 1200 = ₹300. Selling price = 1200 + 300 = ₹1500.
Q2

If compound interest on ₹5000 at 10% p.a. for 2 years is?

A2

Amount = 5000(1.1)² = ₹6050. CI = 6050 − 5000 = ₹1050.
Q3

A and B invest ₹3000 and ₹5000. Annual profit ₹1600. Find B’s share.

A3

Ratio 3:5. B’s share = (5/8)×1600 = ₹1000.
Q4

Average of 5 numbers is 20. If one number 30 is removed, new average?

A4

Sum of 5 = 100. Remove 30 → sum 70 for 4 numbers. New average = 70/4 = 17.5.
Q5

10 men complete a work in 6 days. 12 men will take how many days?

A5

Men × days constant: 10×6 = 12×D ⇒ D = 60/12 = 5 days.
Q6

In a 1000 m race, A beats B by 100 m. Ratio of speeds?

A6

When A runs 1000 m, B runs 900 m. Speed ratio A:B = 1000:900 = 10:9.
Q7

Mixture of 40L milk & water has 20% water. How much water to add to make 30% water?

A7

Milk = 32L (constant). New mixture = 32/0.7 ≈ 45.71L. Water added = 5.71L.
Q8

Selling price ₹540 after 10% discount on marked price. Find marked price.

A8

Discounted price = 90% of MP = 540 ⇒ MP = 540/0.9 = ₹600.
Q9

At what rate of simple interest will ₹800 become ₹1000 in 4 years?

A9

SI = ₹200. SI = P×R×T/100 ⇒ 200 = (800×R×4)/100 ⇒ R = 6.25% p.a.
Q10

In a pie chart, a sector of 72° represents ₹20,000. Total value?

A10

72°/360° = 1/5 fraction. Total = 20,000 × 5 = ₹1,00,000.

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