Question
180 ml of mixture contains milk and water in the ratio
of 15:x respectively. If 55 ml of water and 65 ml of milk is added into it then ratio of milk to water in the resulting mixture will be 2:1. Find the value of ‘x’.ÂSolution
Quantity of milk in 180 ml of mixture = 180 × 15/(15 + x) Quantity of water in 180 ml of mixture = 180 × x/(x + 15) According to question; {2700/(15 + x) + 65}/{180x/(x + 15) + 55} = 2/1 Or, 2700/(15 + x) + 65 = 360x/(x + 15) + 110 Or, (2700 – 360x)/(x + 15) = 45 Or, 2700 – 360x = 45x + 675 Or, 405x = 2025 Or, x = 5
230 192 172 ? 122 100
...What value should come in the place of (?) in the following number series?
64, 80, 104, ?, 176, 224
97, 106, ?, 195, 411, 460
What will come in place of the question mark (?) in the following series?
29, 42, ?, 95, 135, 184
Find the missing term:
2, 6, 15, 31, 56, ?
32   48   96   ?   720   2520
82, 98, 130, 178, 242, ?
4 10 ? 62.5 156.25 390.625
...140, 146, 170, 224, ?, 470
7 47 ? 223 359 527
...
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