Explanation

Monthly expenditure = Rs. 3,500

Savings = 12½%

Expenditure = 100% − 12½% = 87½%

INCOME = Expenditure x 100 / (100 - Saving %)

Income = 2500 x100/87.5

= RS 4000

Last updated 08 Nov 2026 by NA

Explanation

Step 1: Let's denote the two numbers as x and y.
We have two equations:

1. x + y = 28

2. x - y = 4

Step 2: Solve the system of equations.
Adding the two equations eliminates y:
(x + y) + (x - y) = 28 + 4
2x = 32
Step 3: Solve for x.
x = 32 / 2
x = 16
Step 4: Solve for y.
Substitute x into one of the original equations:
16 + y = 28
y = 28 - 16
y = 12
Step 5: Identify the correct pair of numbers.
The numbers are 16 and 12.

Last updated 08 Nov 2026 by NA

Explanation

Given:

Copper : Silver = 3 : 7

Step 1: Find total parts

3+7= 10

Step 2: Silver = 7 parts

Silver percentage= 7/10 x100

$$=70\%$$

$$Last\; updated\; 08\; Nov\; 2026\; by\; NA$$

Explanation

Average is equal to sum of all numbers and divided by Total numbers

= 9+18+27+36+45 = 135/5

=27

Last updated 08 Nov 2026 by NA

Explanation

3+1 = 4

4+3 = 7

7+1 = 8

8+3 = 11

11+1 = 12

12+3 = 15

Last verified on 03-09-2026