Question

find the numbers of coins if the total thickness of all coins is 15 cm and each coin is 0.3cm​

Answer 1

Answer:

Correct option is

C

450

Let n be the number of 1.5 cm diameter coins required to form a right circular cylinder of height 10 cm and diameter 4.5 cm.

Now,

Volume of right circular cylinder =n× volume of 1.5 cm diameter coin.

Therefore,

n=

π(

2

1.5

)

2

×

10

2

π(

2

4.5

)

2

×10

=

20×20

45×45

×

15×15×2

10×20×20×10

=9×10×5

=450

Explanation:

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Answer 2

Answer:

50 Coins

Explanation:

First we will Convert 0.3 cm to mm

0.3=0.3/10 (Remove decimal point and count after points digit means if there is one digit and in place of decimal point write one than put zero means 3/10) now we convert 15 CM to mm means 15×10=150

Now we will divide 3/10×150=50

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