Explanation

Given:

Marked price = Rs. 1500

Discounts: 10% and 6%

First discount (10%):

= 10% of 1500

= 0.1 × 1500

= Rs. 150

Price after 1st discount = 1500 - 150

= Rs. 1350

Second discount (6%):

= 6% of 1350

= 0.06 × 1350

= Rs. 81

Price after 2nd discount = 1350 - 81

= Rs. 1269

Explanation

Mouthwash is a homogeneous solution because its components are evenly mixed and uniform throughout.

You cannot distinguish different parts with the naked eye.

Explanation

Let's solve the equation:

x + 5 = 3

Subtract 5 from both sides:

x = 3 - 5

x = -2

Explanation

Using the power of a power rule:

(x^3)^5 = x^(3×5)

= x^15

Explanation

Given ratio: 5:7

To decrease 91 in the ratio 5:7, let's calculate the new value:

New value = 91 × 5/7

= 65

Explanation

The formula for the circumference of a circle is C = 2πr.

Step 1: Calculate the circumference

Given radius r = 7 cm, and π ≈ 22/7,

C = 2 * (22/7) * 7

= 2 * 22

= 44 cm

Explanation

Alveoli are tiny air sacs in the lungs where oxygen enters the blood and carbon dioxide is removed.

Their thin walls and rich capillary network make gas exchange efficient.

Explanation

a:b = 8:9, b:c = 6:5

Make b same:

a:b = 16:18, b:c = 18:15

So, a:b:c = 16:18:15

Explanation

"Feel good" means experiencing a sense of happiness, well-being, or confidence.

It's often used to describe a positive emotional or physical state.

Explanation

Frequency is calculated using the formula:

f = v / λ

where v = 8 m/s (speed), λ = 2.5 m (wavelength)

So, f = 8 / 2.5 = 3.2 Hz