A father is now three times as old as his son. Five years back he was four times as old as his son. What is the age of the son now?
A12
B15
C18
D20
A12
B15
C18
D20
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$$താഴെ തന്നിരിക്കുന്നവയിൽ ഗുണനഫലം എണ്ണൽ സംഖ്യകൾ വരുന്ന ജോടികൾ ഏവ?
$1) \sqrt {0.8},\sqrt {20}$
$2)\sqrt {0.8},\sqrt {0.2}$
$3)\sqrt {30},\sqrt {1.2}$
$4)\sqrt {0.08},\sqrt {0.02}$