നാല് കുട്ടികൾക്ക് ശരാശരി ഏഴ് വയസ്സ്. അഞ്ചാമത് ഒരു കുട്ടി കൂടി ചേർന്നാൽ ആറു വയസ്സ്. എങ്കിൽ അഞ്ചാമന്റെ വയസ്സ് എത്ര?
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