Answers

  • Brainly User
2016-01-21T07:27:59+08:00
Present ages:
7 = Rina's age
56 = Grandmother's age

Age in x years:
x + 7 = Rina's ages
56 + x = Grandmother's age

Equation:
  
  x + 7 = 1/4 (56 + x)

LCD: 4
  (4) [ 7 + x = 1/4 (56 + x) } (4)
   28 + 4x = 56 + x
   4x - x = 56 - 28
   3x = 28
   3x/3 = 28/3
   x = 28/3   or  9  \frac{1}{3} years   or   9 years and 4 months

ANSWER:  9  \frac{1}{3} years
                    or 9 years and 4 months


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