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Question asked:

the ratio of the present ages of Ravi and Sanjay is 2:3. 15 years hence, the ratio of their ages will be 3:4, find the Sanjay's present age in years.

Answer:

The answer is there in the attached files

Similar question:

• At present, the ratio of the age of Ram and Sanjay is 2:3, and after 5 years from now, its ratio will get changed to 6:7. What is Ram’s present age?

• The ages of Hari and Harry are in ratio 5:7. Four years from now the ratio of their ages will be 3:4. Find their present ages.

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Answer:

The present age of Sanjay is 45 years

Step-by-step explanation:

Given ratio of present ages of Ravi and Sanjay is 2:3.

Let age of Ravi be 2x

and age of Sanjay be 3x.

After 15 year age of Ravj will become =[tex](2x + 15) \: years[/tex]

After 15 years age of Sanjay will become

[tex](3x + 15) \: years[/tex]

After 15 years Ratio of their ages

[tex] = \frac{(2x + 15)}{(3x + 15)} [/tex]

According to question,

[tex] \frac{(2x + 15)}{(3x + 15)} = \frac{3}{4} [/tex]

By cross multiplication,

[tex]4 \times (2x + 15) = 3 \times (3x + 15)[/tex]

[tex]8x+60=9x+45 \\ 9x-8x=60-45 \\ x=15[/tex]

So present age of Ravi is (2x 15)= 30 years

and present age of Sanjay is (3x15)=45 years.

Answer:

d) Pranava plate

Explanation:

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Answer:

First Case (Room),

Length (L) of a floor = 6.5m

Breadth (B) of a floor = 5m

Therefore,

Area of a floor = L × B

= 6.5 × 5 sq. m

= 32.5 sq. m

= 32.5 × 100 × 100 sq. cm

= 325000 sq. cm

Second case (tiles),

Side of a square tile = 25 cm

Therefore,

Area of a square tile = (side)^2

= (25)^2 sq. cm

= 625 sq. cm

Therefore,

No. of tiles required = 325000/625

= 520

Cost of 1 tile = ₹ 9.40 (given)

Therefore,

Cost of 520 tiles = ₹ (520×9.40)

= ₹ 4888 (ans.)

Answer :- The cost of flooring a room 6.5m by 5m with square tiles of side 25 cm at the rate of ₹ 9.40 per tile is ₹ 4888.

Step-by-step explanation:

Rs. 4888

hope it helps you

Given: 560g of iron.

To find: We have to find the number of moles.

Solution:

To determine the number of moles of 560 grams of iron we have to follow the below steps as follows-

We know that the atomic weight of iron or Fe is 56 grams.

56 grams of iron has 1 mole.

Thus 560 grams if the iron has 560/56=10 moles.

560 grams of iron has 10 moles.

Hence the correct option is b.

Answer:

option b is correct

Explanation:

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