Explanation

Current sum of ages = 100 years

5 years ago, their ages were in the ratio of 2:1. Let's call the father's age 5 years ago "2x" and the son's age 5 years ago "x".

We know that 5 years ago, their sum of ages was:

2x + x = 3x

Since the current sum of ages is 100, we can set up an equation:

(2x + 5) + (x + 5) = 100

Combine like terms:

3x + 10 = 100

Subtract 10 from both sides:

3x = 90

Divide by 3:

x = 30

So 5 years ago, the father's age was 2x = 60 and the son's age was x = 30.

Now, let's find their ages after 10 years:

Father's age = 60 + 5 + 10 = 75

Son's age = 30 + 5 + 10 = 45

The ratio of their ages after 10 years is:

75:45 = 5:3

Explanation

7x - 1 = 4x + 8

Add 1 to both sides:

7x = 4x + 9

Subtract 4x from both sides:

3x = 9

Divide both sides by 3:

x = 3

So, the value of x is 3.

Explanation

Principal (P) = 65000

Interest Rate (R) = 3% = 0.03

Interest Amount (I) = 68900 - 65000 = 3900 (since the interest amount is the total amount paid minus the principal)

We can use the formula: I = P × R × T

Rearranging the formula to solve for T, we get:

T = I / (P × R)

= 3900 / (65000 × 0.03)

= 3900 / 1950

= 2 years

So, it takes 2 years for the interest to become 68900.

Explanation

750000*10/100= 7500

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