Musa is 12 years older than his sister Bisi, in 4 years time Musa will be twice as old as Bisi. Find their present ages.

Bisi is X yrs. old.

Musa is (x+12) yrs. old.

Four yrs. later:
Bisi is (x+4) yrs. old.
Musa is 2(x+4) = 2x+8.

2x+8 = (x+4) + 12.
2x+8 = x+16, X = 8.
x+12 = 8+12 = 20.

Present age

Ah, the age-old question of age! Let's do some math and solve this riddle together.

Let's say Bisi's present age is "x". According to the information given, Musa is 12 years older, so Musa's age would be "x + 12".

Now, let's fast forward 4 years into the future. In 4 years, Bisi's age would be "x + 4" and Musa's age would be "x + 12 + 4" = "x + 16".

According to the riddle, Musa will be twice as old as Bisi in 4 years. So, we can set up an equation:

(x + 16) = 2(x + 4)

Simplifying this equation, we get:

x + 16 = 2x + 8
16 - 8 = 2x - x
8 = x

Therefore, Bisi's present age, x, is 8.

To find Musa's present age, we substitute x into Musa's age formula:

Musa's age = x + 12 = 8 + 12 = 20.

So, Bisi is 8 years old, and Musa is 20 years old. Ta-da!

Let's represent Musa's present age as M and Bisi's present age as B.

According to the information given, we know that Musa is 12 years older than Bisi. So, we can set up the equation M = B + 12.

We also know that in 4 years, Musa will be twice as old as Bisi. This can be represented as M + 4 = 2(B + 4).

Now we have a system of equations:
M = B + 12
M + 4 = 2(B + 4)

To solve this system, we can substitute the value of M from the first equation into the second equation:

(B + 12) + 4 = 2(B + 4)
B + 16 = 2B + 8

Simplifying the equation, we get:
16 - 8 = 2B - B
8 = B

Therefore, Bisi's present age is 8 years.

Substituting this value back into the first equation, we can find Musa's present age:
M = B + 12
M = 8 + 12
M = 20

Thus, Musa's present age is 20 years and Bisi's present age is 8 years.

To solve this problem, let's start by assigning variables to the ages of Musa and Bisi. Let's assume Musa's age is represented by M, and Bisi's age is represented by B.

According to the problem, Musa is 12 years older than Bisi. We can write this as an equation: M = B + 12.

In four years, Musa will be twice as old as Bisi. If we add 4 years to their present ages, we can write this as: (M + 4) = 2(B + 4).

Now we have two equations:
M = B + 12
M + 4 = 2(B + 4)

To find their present ages, we need to solve these equations simultaneously.

First, let's substitute the value of M from the first equation into the second equation:
B + 12 + 4 = 2(B + 4)
B + 16 = 2B + 8

Next, let's simplify the equation:
16 - 8 = 2B - B
8 = B

We have found Bisi's present age: B = 8.

To find Musa's present age, we can substitute B = 8 in the first equation:
M = 8 + 12
M = 20

Therefore, Musa's present age is 20 and Bisi's present age is 8.