Please solve the question number 5.
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Given,
the average age of three boys is = 15
ratio of their age is = 3:5:7
3x+5x+7x/3=15
15x/3=15
15x=15×3
x= 15×3/15
x=3
the age of the oldest one is = 7×3
= 21 years
The age of the oldest one is 21 years
the average age of three boys is = 15
ratio of their age is = 3:5:7
3x+5x+7x/3=15
15x/3=15
15x=15×3
x= 15×3/15
x=3
the age of the oldest one is = 7×3
= 21 years
The age of the oldest one is 21 years
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