A father is 25 years older then his son. Ten years ago father’s age was 6 times of his son’s age. What is the present age of son?
A10
B15
C30
D40
A10
B15
C30
D40
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$$താഴെ തന്നിരിക്കുന്നവയിൽ ഗുണനഫലം എണ്ണൽ സംഖ്യകൾ വരുന്ന ജോടികൾ ഏവ?
$1) \sqrt {0.8},\sqrt {20}$
$2)\sqrt {0.8},\sqrt {0.2}$
$3)\sqrt {30},\sqrt {1.2}$
$4)\sqrt {0.08},\sqrt {0.02}$