ether? he sum of the ages of Mr. Daniel and his laughter is 60 years. 5 years ago, the ratio of heir ages was \( 1: 4 \). a) How old are they now?
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Let's denote Mr. Daniel's age as \( D \) and his daughter's age as \( d \). According to the information given, we have two equations: 1. \( D + d = 60 \) 2. Five years ago, the ratio of their ages was \( 1:4 \), which translates to \( \frac{D - 5}{d - 5} = \frac{1}{4} \). From the second equation, we can express it as: \[ 4(D - 5) = d - 5 \] Expanding this gives us: \[ 4D - 20 = d - 5 \] Rearranging results in: \[ d = 4D - 15 \] Now, we can substitute this expression for \( d \) into the first equation: \[ D + (4D - 15) = 60 \] Simplifying yields: \[ 5D - 15 = 60 \] Adding 15 to both sides, we get: \[ 5D = 75 \] Dividing by 5 gives: \[ D = 15 \] Now, substituting \( D \) back into the first equation to find \( d \): \[ 15 + d = 60 \] This simplifies to: \[ d = 45 \] Thus, Mr. Daniel is 15 years old, and his daughter is 45 years old now.