Practice IBA Mathematics questions with answers and explanations.
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The cost per pen is 150 ÷ 5 = Rs. 30.
Eight pens cost 8 × 30 = Rs. 240.
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Workers and time are inversely proportional for fixed work.
Thus, 12 × 15 = 20 × days, giving 9 days.
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The sum is 12 + 18 + 20 + 30 = 80.
Dividing by 4 gives an average of 20.
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Total equals average multiplied by the number of values.
Thus, 24 × 5 = 120.
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The original total is 8 × 15 = 120.
After removing 22, the total is 98, and 98 ÷ 7 = 14.
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The reciprocal of 0.25 is 1 ÷ 0.25.
Since 0.25 = 1/4, its reciprocal is 4.
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One third of 3/4 is 1/4 of the full tank.
The remaining amount is 3/4 - 1/4 = 1/2.
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One hundred fifty percent equals 1.5.
Multiplying 80 by 1.5 gives 120.
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Since 12.5% = 1/8, one eighth of the number is 25.
The whole number is 25 × 8 = 200.
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After a 30% discount, 70% of the original price remains.
Thus, the original price is 840 ÷ 0.70 = 1,200.
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The decrease is Rs. 75.
The percentage decrease is 75/500 × 100 = 15%.
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Let the number be x, so 0.40x = 72.
Dividing by 0.40 gives x = 180.
