Explanation

Ratio of Math : Physics : Chemistry = 3 : 4 : 5

Total parts = 3 + 4 + 5 = 12 parts

Total marks = 84,000

Value of 1 part = 84,000 / 12 = 7,000

Marks in Physics = 4 parts = 4 * 7,000 = 28,000

Last verified on 03-09-2026

Explanation

Sum: 30 + 15 = 45

Difference: 30 − 15 = 15

Last verified on 03-09-2026

Explanation

Solve: (2x + 3) / (x - 1) = 3

2x + 3 = 3(x - 1)  

2x + 3 = 3x - 3  

3 + 3 = 3x - 2x  

x = 6

Last verified on 04-05-2026

Explanation

Formula: (Part / Total) _ 100

Here Part = 80, Total = 120

Percentage = (80 / 120) _ 100  

= (2 / 3) * 100  

= 66.666...%

Last verified on 03-09-2026

Explanation

Let the younger brother's present age = x years

Then older brother's present age = x + 9 years

After 5 years:

Younger brother's age = x + 5

Older brother's age = x + 9 + 5 = x + 14

Sum after 5 years = 49

So, (x + 5) + (x + 14) = 49  

2x + 19 = 49  

2x = 49 - 19  

2x = 30  

x = 15

Younger brother = 15 years  

Older brother = x + 9 = 15 + 9 = 24 years

Last verified on 04-09-2026

Explanation

Let the son's age = x years

Mother's age = 5 times son's age = 5x years

Sum of their ages = 60 years

So, x + 5x = 60

6x = 60  

x = 60 / 6  

x = 10

Son's present age = 10 years

Last verified on 04-09-2026

Explanation

Discount = List Price − Sale Price

= Rs. 1,500 − Rs. 1,350 = Rs. 150

Therefore, the discount is Rs. 150.

Last verified on 04-09-2026

Explanation

A is the mother of B.

B is married to C, so C is B’s husband.

Therefore, C is the son-in-law of A.

Last verified on 04-09-2026

Explanation

The pattern is: ×2 + 1

6 × 2 + 1 = 13

13 × 2 + 1 = 27

27 × 2 + 1 = 55

55 × 2 + 1 = 111

Last verified on 02-08-2026

Explanation

Total balls = 1 + 2 + 3 = 6

Red balls = 3

Probability = 3/6 = 1/2

Verified & Updated