15 years ago Cynthia was thrice as old as Brittany. The sum of their present ages is 94 years. How old is Brittany now?
15 years ago , let the age of Cynthia be c and Brittany be b.
c = 3b
Present ages of Cynthia will be (c+15) and Brittany be (b+15). Their sum is 94.
c + 15 + b+ 15 = 94
=> c+b= 64
=> 4b = 64
=> b = 16
Present age of Brittany is 31 years (16 + 15).
So , the answer would be option d)31 years.
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