Mathcounts

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Quoc Tran Anh Le Coodinator
27/02/2019 at 11:13
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Bob has 40 cents in his pocket. If Bob has no pennies, how many different combinations of quarters, dimes and/or nickels could he have?

 

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Huỳnh Anh Phương
11/02/2019 at 08:34
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8 notebooks costs $16.80, 5 pens costs $15.25. Anna buys 4 notebooks and 8 pens, Benny buys 5 notebooks and 10 pens. All 2 gives the shopkeeper 2 $20 notes. Who recived more money and recived more than how much money?
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    FacuFeri 23/02/2019 at 12:39

    Conandtb spam 

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    Nguyễn Mạnh Hùng 16/02/2019 at 13:23

    A notebook costs: 16.80 : 8 = 2.10 ($)

    A pen costs: 15.25 : 5 = 3.05 ($)

    Anna buys: 2.10 x 4 + 3.05 x 8 = 8.40 + 24.40 = 32.80 ($) 

    Anna received: 2 x 20 - 32.80 = 7.20 ($)

    Benny buys: 5 x 2.10 + 10 x 3.05 = 10.50 + 30.50 = 41 ($)

    Benny received: 2 x 20 - 41 = -1 ($) 

    => Anna received more and more than: 7.20 + 1 = 8.20 ($)

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    Conandtb 21/02/2019 at 14:21

    A notebook costs: 16.80 : 8 = 2.10 ($)

    A pen costs: 15.25 : 5 = 3.05 ($)

    Anna buys: 2.10 x 4 + 3.05 x 8 = 8.40 + 24.40 = 32.80 ($) 

    Anna received: 2 x 20 - 32.80 = 7.20 ($)

    Benny buys: 5 x 2.10 + 10 x 3.05 = 10.50 + 30.50 = 41 ($)

    Benny received: 2 x 20 - 41 = -1 ($) 

    => Anna received more and more than: 7.20 + 1 = 8.20 ($)


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Huỳnh Anh Phương
09/01/2019 at 12:34
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Linda has oranges and bunch of grapes. She wants exchange to get watermelons. 5 oranges can exchange for 1 bunch of grapes. 5 bunch of grapes can exchange for 1 watermelons. How many oranges can exchange for 3 watermelons?

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Huỳnh Anh Phương
06/01/2019 at 04:25
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A train wheel can drive with the speed 180 rpm ( rotations per minute ) . How long time to get 600 rotations ? Express your answer in the form x minutes y seconds, where x and y are whole numbers.

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Huỳnh Anh Phương
06/01/2019 at 04:14
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3 riders: Abe, Bagan, Cody are in the 100m bicycle race. The distance Abe can ride is 25 mpm (meter per minute) , Bagan can ride 12 mpm and Cody can ride 10 mpm. Who wins?

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Quoc Tran Anh Le Coodinator
01/01/2019 at 12:28
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Vijay gives Sanjay a set of four weights of 1, 3, 8 and 26 grams. When Sanjay places weights on either side of a balance, what is the smallest positive integer number of grams that he cannot measure with this set?

 

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Quoc Tran Anh Le Coodinator
01/01/2019 at 12:27
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If the results when reading a measuring stick can be off by at most 1 cm, what is the maximum percent error when 24 cm is measured? Express your answer to the nearest tenth.

 

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Quoc Tran Anh Le Coodinator
01/01/2019 at 12:27
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If a race car is traveling at 99 mi/h, how many meters does it travel in a second, given that 0.305 meter = 1 foot? Express your answer as a decimal to the nearest tenth.

 

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Quoc Tran Anh Le Coodinator
01/01/2019 at 12:26
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On the planet Klem, 1 Bem plus 7 Dems equals 4 Pems, and 2 Bems plus 1 Dem equals 1 Pem. How many Dems equal 7 Bems?

 

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Quoc Tran Anh Le Coodinator
01/01/2019 at 12:25
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The weight of a small clip is \(\dfrac{2}{3}\) the weight of a large clip. If 2 tacks weigh the same amount as a large clip, how many tacks weigh the same amount as 12 small clips?