Let Melinda's age, be M	

Then Katty's is: 

We then get: 	

	

3M + 60 = 5M ------ Multiplying by LCD, 5	

60 = 5M - 3M	

M, or Melinda is: 

This is based on: "In four years three times Katty's age will equal Melinda's" CURRENT age

If it's, "In four years three times Katty's age will equal Melinda's" AGE THEN, then Melinda is now 20 years-old. 

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