Question

RATIO AND PROPORTION :
32. The ratio of marks obtained by Ramesh, Suresh and Naresh in an examination is 12:8:15. Find
the marks obtained by Suresh and Naresh , if Ramesh scored 15 marks less than that of Naresh
1) 40.75
2) 60.45
3) 25. 45
4) 30.45 ​

Answer 1

Step-by-step explanation:

ratio of the age of Ajay and Vijay is 3 : 4. After five years the new ratio of their ages will be 4:5. What is the age of Vijay at present?, 1)15 2)20 3)18 answer is 20 i need explanation please

Answer 2

$\Large{\textbf{\underline{\underline{According\:to\:the\:Question}}}}$

${\boxed{\sf\:{Marks\;gained\;by\;Suresh}}}$

= 40

${\boxed{\sf\:{Marks\;gained\;by\;Naresh}}}$

= 75

Ratio = 12 : 8 : 15.

Assume,

${\boxed{\sf\:{Marks\;gained\;by\;Ramesh=12x}}}$

${\boxed{\sf\:{Marks\;gained\;by\;Suresh=8x}}}$

${\boxed{\sf\:{Marks\;gained\;by\;Naresh=15x}}}$

Situation

Ramesh gained 15 marks < than Naresh

Marks of Ramesh = Marks of Naresh - 15

12x = 15x - 15

15 = 15x - 12x

15 = 3x

$\tt{\rightarrow x=\dfrac{15}{3}=x}$

x = 5

${\boxed{\sf\:{Marks\;gained\;by\;Ramesh}}}$

= 12x

= 12(5)

= 60

${\boxed{\sf\:{Marks\;gained\;by\;Suresh}}}$

= 8x

= 8(5)

= 40

${\boxed{\sf\:{Marks\;gained\;by\;Naresh}}}$

= 15x

= 15(5)

= 75