Since Amanda is 25 years old now, in 5 years she will be 25+5 = 30 years old. Then Simone age in 5 years will be= 15 years, according to the condition. Hence, Simon is 15-5 = 10 years old now. It is his current age. ANSWER It is what the condition says and how it should be understood. No equations are needed -- only a bit of common sense.