Alex has four $ 1 bills, three $5 bills, and one $10 bill. if Alexi randomly removes two bills without replacement, determine whether the probability will total $ 15 is greater than the probability that the bills will total $ 2.
2. Linda paid $48 for a jacter that was on sale for 25% of the original price . what was original price of the jacket .
explain in details
Math problem
2007-06-14 11:48 am
回答 (2)
2007-06-14 11:08 pm
✔ 最佳答案
1) P(bills will total $15) = 3/8 * 1/7 + 1/8 * 3/7where 3/8 is the prob. of geting a bill of $5 first,
1/7 is then the prob. of geting a bill of $10,
1/8 is the prob. of geting a bill of $10 first,
3/7 is then the prob. of geting a bill of $5.
Therefore, P(bills will total $15) = 3/8 * 1/7 + 1/8 * 3/7
= 3/28.
P(bills will total $2) = 4/8 * 3/7
where 4/8 is the prob. of geting a bill of $1 first,
3/7 is then the prob. of geting another bill of $1,
Therefore, P(bills will total $2) = 4/8 * 3/7
= 3/14 = 6/28.
So the probability that the bills will total $ 2 is greater than the probability that the bills will total $ 15.
2) Let $x be the original price.
x * (1-25%) = 48
75% * x = 48
x = 48 * 100/75 = 64.
2007-06-14 11:55 am
i really don't understand what ques 1 talking about
but i can teach you to do question 2
method 1:48/0.75
method 2:
let the original price of the jacket be $x
x*0.75 =48
solvex,xwill be the original price.
but i can teach you to do question 2
method 1:48/0.75
method 2:
let the original price of the jacket be $x
x*0.75 =48
solvex,xwill be the original price.
參考: my maths knoeledge
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