# Thread: Value of an expression.

1. Good post? |

## Value of an expression.

0.5r+0.05s=?

1). 0.2r+0.02s=10

2). 0.5s+0.2r=0.45s-0.3r

2. Good post? |
A seems to be appropriate. Dividing A) by 2 and then multiplying it by 5 will give us an answer.

3. Good post? |
Its D.

4. Good post? |
Stmt (I)
0.2r+0.02s=10

=> 0.1r + 0.01s = 5
=> 0.5r + 0.05s = 25

Sufficient

Stmt (II)
0.5s+0.2r=0.45s-0.3r

=> 0.5s-0.45s + 0.2r+0.3r = 0
=> 0.5r + 0.05s = 0

Sufficient.

Hence (D)

5. Good post? |
Ans should be D
0.5r+0.05s=?
5r/100 + 5s/1000
=> (50r+5s)/1000 => (10r+s)/200 =?

Statement 1:
0.2r+0.02s=10
=> 2r/100 +2s/1000 =10
=> 20r+2s=10000
=> 10r+s=5000
substituting in stem, we get,
5000/200=25(ANs)

Statement2:
0.5s+0.2r=0.45s-0.3r
5s/100 + 2r/100 = 45s/1000 - 3r/100
=> 5r/100 = 45s/1000 - 5s/100
=> 5r/100 = (45s-50s)/1000
=> 50r=-5s
=> s=-10r
substituting in stem,

(10r+s)/200 =0(ANS)

thanx

6. Good post? |
D is right....
B) can independently give the value as 0.5r + 0.05s = 0

I need to learn to read the complete question.... patiently!!!

7. Good post? |
I agreed with the approach. However, I am having problem with the fact that statement 1 gives a different answer than statement 2 does.

8. Good post? |
Yeah,I too had the same doubt/q.

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