In this chapter, we provide RS Aggarwal Solutions for Class 7 Chapter 9 Unitary Method Ex 9B for English medium students, Which will very helpful for every student in their exams. Students can download the latest RS Aggarwal Solutions for Class 7 Chapter 9 Unitary Method Ex 9B Maths pdf, free RS Aggarwal Solutions Class 7 Chapter 9 Unitary Method Ex 9B Maths book pdf download. Now you will get step by step solution to each question.

Textbook | NCER |

Class | Class 7 |

Subject | Maths |

Chapter | Chapter 9 |

Chapter Name | Unitary Method |

Exercise | 9B |

**RS Aggarwal Solutions for Class 7 Chapter 9 Unitary Method Ex 9B Download PDF**

**Question 1.****Solution:**

48 men can dig a trench in = 14 days

1 man will dig the trench in = 14 x 48 days (less men more days)

28 men will dig the trench m = 14×4828 (more men less days)

= 24 days

**Question 2.****Solution:**

In 30 days, a field is reaped by = 16 men

In 1 day, it will be reaped by = 16 x 30 (less days, more men)

and in 24 days, it will be reaped by = 16×3024 men (more days, less men)

= 48024

= 20 men

**Question 3.****Solution:**

In 13 days, a field is grazed by = 45 cows.

In 1 day, the field will be grazed by = 45 x 13 cows (less days, more cows)

and in 9 days the field will be grazed by = 45×139 cows (more days, less cows)

= 5 x 13 = 65 cows

**Question 4.****Solution:**

16 horses can consume corn in = 25 days

1 horse will consume it in = 25 x 16 days (Less horse, more days)

and 40 horses will consume it in = 25×1640 days (more horses, less days)

= 10 days

**Question 5.****Solution:**

By reading 18 pages a day, a book is finished in = 25 days

By reading 1 page a day, it will be finished = 25 x 18 days (Less page, more days)

and by reading 15 pages a day, it will be finished in = 25×1815 days (more pages, less days)

= 5 x 6 = 30 days

**Question 6.****Solution:**

Reeta types a document by typing 40 words a minute in = 24 minutes

She will type it by typing 1 word a minute in = 24 x 40 minutes (Less speed, more time)

Her friend will type it by typing 48 words 24 x 40 a minute in = 24×4048 minutes

(more speed, less time)

= 20 minutes

**Question 7.****Solution:**

With a speed of 45 km/h, a bus covers a distance in = 3 hours 20 minutes

= 313 = 103 hours

With a speed of 1 km/h it will cover the distance m = 10×453 h

(Less speed, more time)

and with a speed of 36 km/h, it will cover the distance in

= 10x453x36 hr (more speed, less time)

= 256 h

= 416 h

= 4 hr 10 minutes

**Question 8.****Solution:**

To make 240 tonnes of steel, material is sufficient in = 1 month or 30 days

To make 1 tonne of steel, it will be sufficient in = 30 x 240 days (Less steel, more days)

To make 240 + 60 = 300 tonnes of steel it will be sufficient in = 30×240300 days

= 24 days (more steel, less days)

**Question 9.****Solution:**

In the beginning, number of men = 210

After 12 days, more men employed = 70

Total men = 210 + 70 = 280

Total period = 60 days.

After 12 days, remaining period = 60 – 12 = 48 days

Now 210 men can build the house in = 48 days

and 1 man can build the house in = 48 x 210 days (less men, more days) .

280 men can build the house in = 48×210280 days

(more men, less days)

= 36 days

**Question 10.****Solution:**

In 25 days, the food is sufficient for = 630 men

In 1 day, the food will be sufficient for = 630 x 25 men (less days, more men)

and in 30 days, the food will be sufficient for = 630×2530 hr

(more days less men)

= 525 men

Number of men to be transfered = 630 – 525 = 105 men

**Question 11.****Solution:**

Number of men in the beginning = 120

Number of men died = 30

Remaining = 120 – 30 = 90 men

Total period = 200 days

No. of days passed = 5

Remaining period = 200 – 5 = 195

Now, The food lasts for 120 men for = 195 days

The food will last for 1 man for = 195 x 120 days (Less men, more days)

The food will last for 90 men for = 195×12090

(more men less days)

= 65 x 4 = 260 days

**Question 12.****Solution:**

Period in the beginning = 28 days

No. of days passed = 4 days.

Remaining period = 28 – 4 = 24 days

The food is sufficient for 24 days for = 1200 soldiers

The food will be sufficient for 1 day for = 1200 x 24 soldiers (Less days, more men)

and the food will be sufficient for 32 days = 1200×2432

= 900 soldiers (more days, less men)

No. of soldiers who left the fort = 1200 – 900 = 300 soldiers

**All Chapter RS Aggarwal Solutions For Class 7 Maths**

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**All Subject NCERT Solutions For Class 7**

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