Question
The average weight of 10 books is 5 kg. If 6 new books
are added, the new average increases by 3 kg. What will be the average weight of the 6 new books?Solution
Total books = 10 + 6 = 16 books Increment in average = 5 + 3 = 8 kg Now, Weight of 18 new books = (16 × 8) – (10 × 5) = 78 kg ∴ Required average = 78/6 = 13 kg
In the following question, select the related number from the given alternatives.
22 : 330 :: 28 : ?
Select the correct combination of mathematical signs to replace the '*' signs and to balance the given equation.
169 * 13 * 30 * 12 * 4 * 18 = 85
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Select the correct combination of mathematical signs that can sequentially replace '*' sign and balance the equation given below.
86 * (38 * 1...
If ‘+’ means ‘-’, ‘×’ means ‘+’, ‘-’ means ‘÷’ and ‘÷’ means ‘×’, then what is the value of the following expression...
If + means −, − means ×, × means ÷, and ÷ means +, what will be the value of the following expression?
19 ÷ 14 + 8 – 12 × 3
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