Question
If 15 buttons are bought at Rs 1 and sold at the rate of
10 buttons at Rs 1, what will be the percentage profit?Solution
The cost price of 15 buttons = 1 Rs CP of 1 button = 1/15 Rs and the selling price of 10 buttons = 1 Rs The selling price of 1 button = 1/10 Rs now the ratio of CP and SP = 1/15: 1/10 = 10:15= 2:3 Percent of profit = 1/2 ×100 = 50%
17 21 51 169 701 ?
7 47 ? 223 359 527
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...117, 117, 121, 129, 141, ?
1221,     1100,     1000,     919,       ?
...What will come in place of the question mark (?) in the following series?
206, 187, ?, 157, 146, 139
16, 32, 68, 132, ?, 376
Find the missing number in the given number series.
5, 9, 18, 34, 59, ?Find the missing number in the given number series.
2, 5, 11, 23, 47, ?Find the missing number in the given number series.
 6, 13, 32, 87, ?, 737
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