Question
The average wage of a group of 30 labourers is Rs. 400.
If 4 persons receiving average wage of Rs. 320 leave the group and 2 persons receiving average wage of Rs. K join the group, then the average wage of the group increases by Rs. 45. Find the value of ‘K’.Solution
Total wage of 30 labourers in the initial group = 30 × 400 = Rs. 12000 New average wage of the group = 400 + 45 = Rs. 445 New number of labourers in the group = 30 – 4 + 2 = 28 So, according to the question, 12000 – 4 × 320 + 2K = 445 × 28 Or, 12000 – 1280 + 2K = 12460 Or, 12000 + 2K = 12460 Or, 2K = 12460 – 12000 = 1740 Or, K = (1740/2) = 870
What will come in place of the question mark (?) in the following series?
15, 26, 39, 56, ?, 98
28, 43, 73, 118, ?, 253
8    12    39      ?       180    216
...226  231   466  ?  5606  28031    Â
48   49    45     54    ?      63      27
...107    157    194    ?     237    247
...-1, 5, 23, 59, ?
51 26 27 ? 86 217.5
- What will come in place of the question mark (?) in the following series?
6, 6, 9, ?, 32, 56 What will come in place of the question mark (?) in the following series?
35, 38, 46, ?, 85, 120
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