Question 356758
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Hi,
Miriam 'always' was and 'always' will be 4 year older than Ricardo
Let x be Ricardo's age and (x+4) Miriam's age
.
Question states following was true 10 years ago
(x+4) = 3x
4=2x
2 = x  
Ten years ago: Ricardo was 2 and Miriam was 6
Now Ricardo is 12 and Miriam is 16
.
check your answer
16 -10 = 3*(12-10)