the average of 3 boys is 16 years If their ages are in the ratio 4:5:7 then the age of youngest boys is ?
Answers
Answered by
102
AnswEr :
- Let the Boys be A, B & C and, their respective ages be 4n, 5n & 7n
- Average Age of Boys = 16 years
• According to the Question Now :
• A G E S ⠀O F ⠀B O Y S :
◗ A = 4n = 4(3) = 12 years
◗ B = 5n = 5(3) = 15 years
◗ C = 7n = 7(3) = 21 years
⠀
∴ Hence, Age of youngest boy is 12 years.
Answered by
74
★ Average age of Boys = 15
★ Ratio of ages of boys is 4:5:7
Let the ages be
4x , 5x and 7x
Now use formula for average
⇒16 = 4x + 5x + 7x/3
⇒16 = 16x/3
⇒16*3 = 16x
⇒48 = 16x
⇒x = 48/16
⇒x = 3
Ages of boys are :
- 4x = 4(3) = 12 years
- 5x = 5(3) = 15 years
- 7x = 7(3) = 21 years
∴ Youngest age is of 12 years boy
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