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yan [13]
3 years ago
12

You have a package of 20 assorted thank-you cards. You pick the four cards shown. How many of the 20 cards would you expect to h

ave flowers on them?

Mathematics
2 answers:
fgiga [73]3 years ago
8 0

Answer:

5 cards

Step-by-step explanation:

There's 20 cards and in 1 group, 4 cards. There are 1 out of 4 cards in each group. If you keep counting, there will be 5 in total, because 4*5=20. Think of it like this: Each period is a card without flowers and each comma is a card with flowers.

..., ..., ..., ..., ...,

Hope this helps!

AlladinOne [14]3 years ago
7 0

Answer:

5 out of 20

Step-by-step explanation:

1 out of four cards have flowers on them which it means you can expect a fourth of the 20 twenty cards to have flowers. 20 divided by 4 is five.

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I will use the quadratic formula.

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Rachel has 20 nickels, dimes, and quarters worth $3.70. if she has twice as many quarters as dimes, how many nickels does she ha
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If  X= the number of dimes  at .10 each

Then  2x= the number of quarters at .25 each and

20-(X-2X)= the number of nickels at .05 each

<span> <span><span> <span> The equation will be: X(.1)+2(X).25+(20-X-2X).10=3.70 </span> </span> <span> </span> <span> <span> .1X+2X(.25)+(20-X-2X).05=3.70 </span> </span> <span> <span> .1X+.5X+(20-3X).05=3.70 </span> </span> <span> <span> .6X+(1-.15X)=3.70 </span> </span> <span> <span> .6X+1-.15X=3.70 </span> </span> <span> <span> .45X=3.70-1 </span> </span> <span> <span> .45X=2.70 </span> </span> <span> <span> X=2.70/.45 </span> </span> <span> <span> X=6 number of dimes </span> </span> <span> <span> 2X=12 number of quarters </span> </span> <span> <span> 20-6-12=2 number of nickels </span> </span> </span></span>
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3 years ago
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