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A bag had 90 marbles. John came and took...

A bag had 90 marbles. John came and took 38 away and Amit put in some more marbles in the bag. If the number of marbles in the bag now are 15 more than the number that was in the bag initially, find how many marbles Amit had put in the bag.

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53
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Represent the following situations mathematically: (i) John and Jivanti together have 45 marbles. Both of them lost 5 marbles each and the product of the number of marbles they now have is 124. We would like to find out how many marbles they had to start with. A cottage industry produces a certain number of toys in a day. The cost of production of each toy (in rupees) was found to be 55 minus the number of toys produced in a day. On a particular day, the total cost of production was RS.750. We would like to find out the number of toys produced on that day.

A bag contains 7 blue marbles and 14 marbles that are not blue. If one marbles is drawn at random from the bag, what is the probability that the marbles is blue?

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ICSE-INTEGERS-EXERCISE 1.1
  1. Verify the commutative property of addition of integers for the intege...

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  2. Verify the commutative property of addition of integers for the intege...

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  3. Verify that 23+(14+52)=(23+14)+52

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  4. Write the associative property of addition of integers taking a, b and...

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  5. What is the additive identity of -6?

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  6. Which integer is its own additive identity?

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  7. Write the additive inverse of: a. (-212). b. 666.

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  8. Write down the integers, if any, that do not have inverses under addit...

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  9. Write down all integers that are their own inverses under addition.

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  10. Give a counter example to show that if integers are not commutative un...

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  11. Verify that: (23-17)-9 ne 23-(17-9)

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  12. Show that the associative property does not hold for integers under su...

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  13. Give examples of: One positive and one negative integer whose sum is...

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  14. Give examples of: Two negative integers whose sum is -21.

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  15. Give examples of: One negative and one positive integer whose differ...

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  16. Give examples of: Two negatigve integers whose difference is 14.

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  17. Subtract the sum of -368 and 245 from -211.

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  18. The sum of two integers is -117. If one of the integer is 85, find the...

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  19. A bag had 90 marbles. John came and took 38 away and Amit put in some ...

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  20. The temperature on a winter morning at a hill station was -4^(@)C. Aft...

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