42. The average age of 3 boys is 16 years. If the ratio of their ages is 4:5:7, then what is the age of the youngest boy? / 3 लड़कों की औसत आयु 16 वर्ष है। यदि उनकी आयु का अनुपात 4:5:7 है, तो सबसे छोटे लड़के की आयु क्या है?
8 years
9 years
12 years
16 years
Answer / उत्तर - 16 years
explanation / स्पष्टीकरण :-
total age of three child is = 16 x3
= 48
yongest one = x
now x= ( 4 / 4+5+7) x48
x = 16 year
explanation / स्पष्टीकरण :-
total age of three child is = 16 x3
= 48
yongest one = x
now x= ( 4 / 4+5+7) x48
x = 16 year
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