Explanation

x/5 + 4 = x/4 -10

x/5 - x/4 = -10 -4

4x - 5x /20 = -14

4x - 5x = -14 x 20

- x = - 280

x = 280

Explanation

If 4/10 of a number is 16, then:

(4/10) × number = 16

Number = 16 ÷ (4/10) = 16 × (10/4) = 16 × 2.5 = 40

So, the number is 40

Explanation

The square root of 225 is 15.

Explanation

- A shirt is a type of dress.  

- A mango is a type of fruit.  

Explanation

The prime numbers after 5 are: 7, 11, 13...  

So, the next prime number after 5 is 7.

Explanation

To find the purchase price, use the formula:

Selling Price = Purchase Price × (1 - Loss%)

Given:  

Selling Price = Rs. 25,000  

Loss = 20% → (1 - 0.20) = 0.80

Now,

25,000 = Purchase Price × 0.80  

Purchase Price = 25,000 ÷ 0.80 = Rs. 31,250

Explanation

Let the number be x.  

x - 0.4x = 30 → 0.6x = 30 → x = 30 ÷ 0.6 = 50  

Explanation

Two hundred one million = 201,000,000  

Five hundred six thousand = 506,000  

Twelve = 12  

Sum = 201,000,000 + 506,000 + 12 = 201,506,012  

Explanation

25% of Rs. 1600 = 0.25 × 1600 = Rs. 400  

5% of Rs. 400 = 0.05 × 400 = Rs. 20  

Explanation

3x - 15 - 6 = 0 → 3x - 21 = 0 → 3x = 21 → x = 7