Let Billy have x common cards, and y premium cards:
(i) Billi has 124 cards:
x+y=124
(ii) the total value of the cards is 81.50$:
0.5x $ + 1.00*y $= 81.50 $, so
0.5x+y=81.5
we can write y=81.5-0.5x and substitute in (i):
x+y=124
x+(81.5-0.5x )=124
x+81.5-0.5x=124
x-0.5x=124-81.5
0.5x=42.5
x=42.5/0.5=85
y=124-85=39
Answer: Billy has 85 common cards and 39 premium cards
Answer:
second and third choice
Step-by-step explanation:
supplamentary = add up to be 180
Answer:
8
Step-by-step explanation:
<u>Answer-</u>
<em>The printer used </em><em>642 digits</em><em> to print all the pages in the book.</em>
<u>Solution-</u>
There are 250 pages numbered starting from 1 to 250.
The total number of digits would be the sum of digits of all single digits from 1 to 9, all double digits number from 10 to 99, and all triple digits number from 100 to 250.
There are 9 single digit numbers from 0 to 9, 90 double digit numbers from 10 to 99, and 151 triple digit numbers from 100 to 250.
So,
Therefore, the printer used 642 digits to print all the pages in the book.