Question

Algebra
Find the value of :
3c - 15 if c = 10 and d = 5
—- —-
d. d

Answer 1

Step-by-step explanation:

The quickest way is to add the given equations together :

Given. #1. a+b=8,

Given. #2. b+c=10

Given. #3. c+a=12

>> (a+b) + (b +c) +(c +a) = (8 + 10 + 12)

>> (2a + 2b + 2c)

From. #5. put c = 7 into #2 >> b = 10 - 7 = 3

Hence : a = 5; b = 3; c = 7.

Answer : ( a + b + c ) = 15

Answer 2

Answer:

$\frac{3c}{d} - \frac{15}{d} \\ if \: c \: = 10 \: and \: d = 5 \: then \\ \frac{3c}{d} - \frac{15}{d} = > \frac{3 \times 10}{5} - \frac{15}{5} \\ = > 6 - 3 = 3 = > 3$

Step-by-step explanation:

therefore the value of given question is 3 if c = 10 and d =5