ഇപ്പോൾ ഹെലന് 41 വയസ്സും മകൾക്ക് 9 വയസ്സുമാണ്. എത്ര വർഷം കഴിഞ്ഞ് ഹെലന് മകളുടെ മൂന്നിരട്ടി പ്രായം ഉണ്ടാകും ?
A3
B5
C7
D9
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