Question

Evaluate 3 7 r + 5 8 s 7 3 ​ r+ 8 5 ​ sstart fraction, 3, divided by, 7, end fraction, r, plus, start fraction, 5, divided by, 8, end fraction, s when r = 14 r=14r, equals, 14 and s = 8 s=8s, equals, 8.

Answer 1

Therefore the value of given expression when r = 14 and s = 8 is

`(3)/(7)* r + (5)/(8)* s=11`

Explanation:

Given:

`(3)/(7)* r + (5)/(8)* s`

To Find:

Value of above equation when r = 14 and s = 8

Solution:

`(3)/(7)* r + (5)/(8)* s` .............Given

Put,

`r=14\\s=8`

`(3)/(7)* r + (5)/(8)* s=(3)/(7)* 14 + (5)/(8)* 8`

Now 7 × 2 = 14 and 8 will cancel each other we get

`(3)/(7)* r + (5)/(8)* s=3* 2 + 5=6+5=11`

Therefore the value of given expression is

`(3)/(7)* r + (5)/(8)* s=11`