Four more than three-fifths of a number is thirteen what number is it

Hello from MrBillDoesMath!

15

Discussion.

Call the number referred to "n".  Then the problem statement becomes:

4 + (3/5) * n = 13

Multiply both sides of the equation by 5 :

5 ( 4 + (3/5)*n) = 13 * 5  or

5*4 + 5 * (3/5)**n = 13*5

Cancelling the boldfaced 5's gives:

5*4 + 3*n = 13 *5  or

20 + 3*n = 65

Subtracting 20 from both sides gives:

3*n = 65-20 - 45

Dividing by 3 gives n = 15

Check: 4 + (3/5)*15 =  4 + 9 = 13!   Bingo

Regards, MrB

1. sometimes

2.   never

3   .08c = 7.50+.05c   250 pages

step-by-step explanation:

1.   sometimes

the theoretical probability of rolling a 1 is 1/6.   perhaps you got really lucky and never rolled a 1   in those 60 times.   your experimental probability is 0.   or perhaps you rolled a 1   20 times.   your experimental probability is 20/60 is 1/3.     it really just depends on how you rolled in that experiment.

2.   never

the probability of the event occurring is 1.   that is being 100 % sure it will happen.   that is the maximum amount of confidence we have.

3.   no customer card cost:   .08 times number of pages

customer card cost:   7.50 + .05 times number of pages

we want to find when it costs the same amount, so we will set these equal

let c = number of pages

.08c = 7.50+.05c

subtract .05c from each side

.08c-.05c = 7.5+.05c-.05c

.03c=7.5

divide each side by .03

.03c/.03 = 7.5/03

c =250  

the cost is the same at 250 pages

step-by-step explanation:

and 90% of people marry there 7th grade love. since u have read this, u will be told good news 2night. if u don't pass this on nine comments ur worst week starts now this isn't fake. apparently if u copy and paste this on ten comments in the next ten minutes you will have the best day of ur life tomorrow. you will either get kissed or asked out in the next 53 minutes someone will say i love u

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