Find the value of 0.0007293 + 0.0083
0.1
0.5
0.06
0.8
At what simple rate of interest a sum is double in 8 yr ?
11.0%
12.5%
12%
13.5%
If ( a + b) : ( b + c) : ( c + a) = 6 : 7 : 8 and a + b + c = 14, then the value of c is equal to
6
7
8
14
If x - 1x = 12, then the value of 4x2 + 4x2 is
9
- 7
- 8
If 2a + 3b = 17 and 2a + 2 - 3b + 1 = 5, then the value of a and b is
6, 5
3, 2
8, 5
7, 8
B.
According to the question,2a + 3b = 17 and 2a + 2 - 3b + 1 = 5⇒ 4 . 2a - 3 . 3b = 5⇒ 4 . 2a + 4 . 3b - 7 . 3b = 5⇒ 42a + 3b - 7 . 3b = 5⇒ 68 - 5 = 7 × 3b⇒ 7 × 3b = 63⇒ 3b = 9⇒ 3b = 32∴ b = 2
Now, 2a + 32 = 17⇒ 2a = 17 - 9⇒ 2a = 8⇒ 2a = 23∴ a = 3
The value of 1 - 121 - 131 - 14 ... 1 - 1n - 11 - 1n will be
nn + 1
15n
13n
1n
If 9r + 143 . 3 - r3 . 3 - rr = m, then the value of m is
3
32
33
3r