Question
The average cost price of 21 pens (having equal cost
price) decreased by Rs.3, when one of the pen is replaced by a new pen having cost price of Rs.55. Find the cost price of the pen that was replaced.Solution
Let the cost price of each pen be Rs.x So, cost price of 21 pens = Rs.21x According to the question, => (21x – x + 55)/21 = x – 3 => 20x + 55 = 21x – 63 => x = 118 Therefore, the cost price of the pen that was replaced is = Rs.118
(15.15 ×  34.98) + 24.15% of 749.99 = ? + 124.34
?% of 549.83 – 18.05 × 31.96 = 44.94% of 479.84 – 13.98 × 33.13Â
16.98 × 88.05 + 1999.996% of 299.08 + 5.005 % of 4999.997 = ? × 20.98 × 40.009
√28561.11  × √ 960.9  – (18.02)2  =? × 4.95Â
31.98% of 224.99 = 24.98% of ? + 9.91% of 499.99
What will come in place of the question mark (?) in the following series?
2, 4, 12, 60, 420, ?
181.87 ÷ 13.89 X 8.13 + ? = 11.852Â
- What approximate value will come in place of the question mark (?) in the following question? (Note: You are not expected to calculate the exact value.)
- What approximate value will come in place of the question mark (?) in the following question? (Note: You are not expected to calculate the exact value.)
What approximate value should come in the place of question mark in the following questions?
(6.4% of 3125) + (14.9% of 503) = ?
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