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Ben is 12 years older than Ishaan. Ben and Ishaan first met two years ago. Three years ago, Ben was 4 times as old as Ishaan.
How old is Ben now?

Ben is \(12\) years older than Ishaan. Ben and Ishaan first met two years ago. Three years ago, Ben was \(4\) times as old as Ishaan.\newlineHow old is Ben now?

Full solution

Q. Ben is \(12\) years older than Ishaan. Ben and Ishaan first met two years ago. Three years ago, Ben was \(4\) times as old as Ishaan.\newlineHow old is Ben now?
  1. Denoting Ben and Ishaan's ages: Let's denote Ben's current age as BB and Ishaan's current age as II. According to the problem, Ben is 1212 years older than Ishaan, which gives us our first equation:\newlineB=I+12B = I + 12
  2. Equation 11: Ben is 1212 years older: The problem states that three years ago, Ben was 44 times as old as Ishaan. We need to account for the age difference three years ago. So, we subtract 33 from their current ages and set up our second equation:\newlineB3=4×(I3)B - 3 = 4 \times (I - 3)
  3. Equation 22: Age difference three years ago: Now we have a system of two equations:\newline11) B=I+12B = I + 12\newline22) B3=4×(I3)B - 3 = 4 \times (I - 3)\newlineWe can use substitution or elimination to solve this system. Let's use substitution since we already have BB expressed in terms of II in the first equation.
  4. System of equations: Substitute BB from the first equation into the second equation:\newline(I+12)3=4×(I3)(I + 12) - 3 = 4 \times (I - 3)\newlineNow, let's solve for II:\newlineI+9=4I12I + 9 = 4I - 12
  5. Substitution to solve the system: Rearrange the equation to get all terms involving II on one side:\newline9+12=4II9 + 12 = 4I - I\newline21=3I21 = 3I
  6. Solving for Ishaan's age: Divide both sides by 33 to find II:213=I\frac{21}{3} = II=7I = 7
  7. Finding Ben's age: Now that we have Ishaan's current age, we can find Ben's current age using the first equation:\newlineB=I+12B = I + 12\newlineB=7+12B = 7 + 12\newlineB=19B = 19

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