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Secondary School (English Medium) (5 to 8) Class 8 - CBSE Question Bank Solutions for Mathematics

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At what rate percent will a sum of Rs 1000 amount to Rs 1102.50 in 2 years at compound interest?

[7] Comparing Quantities
Chapter: [7] Comparing Quantities
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The measure of one angle of a parallelogram is 70°. What are the measures of the remaining angles? 

[3] Understanding Quadrilaterals
Chapter: [3] Understanding Quadrilaterals
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The compound interest on Rs 1800 at 10% per annum for a certain period of time is Rs 378. Find the time in years.

[7] Comparing Quantities
Chapter: [7] Comparing Quantities
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Two adjacent angles of a parallelogram are as 1 : 2. Find the measures of all the angles of the parallelogram.

[3] Understanding Quadrilaterals
Chapter: [3] Understanding Quadrilaterals
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In a parallelogram ABCD, ∠D = 135°, determine the measure of ∠A and ∠B.

[3] Understanding Quadrilaterals
Chapter: [3] Understanding Quadrilaterals
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The population of a city is 125000. If the annual birth rate and death rate are 5.5% and 3.5% respectively, calculate the population of city after 3 years.

[7] Comparing Quantities
Chapter: [7] Comparing Quantities
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ABCD is a parallelogram in which ∠A = 70°. Compute ∠BC and D.

[3] Understanding Quadrilaterals
Chapter: [3] Understanding Quadrilaterals
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The present population of a town is 25000. It grows at 4%, 5% and 8% during first year, second year and third year respectively. Find its population after 3 years.

[7] Comparing Quantities
Chapter: [7] Comparing Quantities
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Three years ago, the population of a town was 50000. If the annual increase during three successive years be at the rate of 4%, 5% and 3% respectively, find the present population.

[7] Comparing Quantities
Chapter: [7] Comparing Quantities
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There is a continuous growth in population of a village at the rate of 5% per annum. If its present population is 9261, what it was 3 years ago?

[7] Comparing Quantities
Chapter: [7] Comparing Quantities
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In a factory the production of scooters rose to 46305 from 40000 in 3 years. Find the annual rate of growth of the production of scooters.

[7] Comparing Quantities
Chapter: [7] Comparing Quantities
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The annual rate of growth in population of a certain city is 8%. If its present population is 196830, what it was 3 years ago?

[7] Comparing Quantities
Chapter: [7] Comparing Quantities
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The population of a town increases at the rate of 50 per thousand. Its population after 2 years will be 22050. Find its present population.

[7] Comparing Quantities
Chapter: [7] Comparing Quantities
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The sum of two opposite angles of a parallelogram is 130°. Find all the angles of the parallelogram.

[3] Understanding Quadrilaterals
Chapter: [3] Understanding Quadrilaterals
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All the angles of a quadrilateral are equal to each other. Find the measure of each. Is the quadrilateral a parallelogram? What special type of parallelogram is it?

[3] Understanding Quadrilaterals
Chapter: [3] Understanding Quadrilaterals
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The count of bacteria in a culture grows by 10% in the first hour, decreases by 8% in the second hour and again increases by 12% in the third hour. If the count of bacteria in the sample is 13125000, what will be the count of bacteria after 3 hours?

[7] Comparing Quantities
Chapter: [7] Comparing Quantities
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Two adjacent sides of a parallelogram are 4 cm and 3 cm respectively. Find its perimeter.

[3] Understanding Quadrilaterals
Chapter: [3] Understanding Quadrilaterals
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The population of a certain city was 72000 on the last day of the year 1998. During next year it increased by 7% but due to an epidemic it decreased by 10% in the following year. What was its population at the end of the year 2000?

[7] Comparing Quantities
Chapter: [7] Comparing Quantities
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The perimeter of a parallelogram is 150 cm. One of its sides is greater than the other by 25 cm. Find the length of the sides of the parallelogram. 

[3] Understanding Quadrilaterals
Chapter: [3] Understanding Quadrilaterals
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6400 workers were employed to construct a river bridge in four years. At the end of the first year, 25% workers were retrenched. At the end of the second year, 25% of those working at that time were retrenched. However, to complete the project in time, the number of workers was increased by 25% at the end of the third year. How many workers were working during the fourth year?

[7] Comparing Quantities
Chapter: [7] Comparing Quantities
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