1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
hjlf
3 years ago
11

digit at tens place of two digit number is twice the digit at units place .if sum of this number and the no.formed by reversing

the digit is 66,. find the number
Mathematics
1 answer:
Dima020 [189]3 years ago
8 0
Let the number be     xy ,

xy = 10x + y.   when reversed = yx = 10y + x

x = 2y          ........(a)

10x + y + 10y + x = 66.........(b)

10(2y) + y + 10y + 2y = 66

20y + y + 10y + 2y = 66

33y = 66

y = 66/33

y = 2

x = 2y = 2*2 = 4

Recall the original number is xy =     42.
You might be interested in
Evaluate (x-a+3) if the value of x is (a+7).
Nikitich [7]

Answer:

3(x - a)(x - b)(x - c) when a + b + c = 3x .

Step-by-step explanation:

i don't know but this has to be right

4 0
3 years ago
Yul has lunch at a restaurant. The bill is $14.50 and the sales tax amount is 5%. If he wants to leave a 20% tip after the sales
jek_recluse [69]

Answer:

The tip will be $3.05.

The bill will cost $18.28 with the tip and tax.

Step-by-step explanation:

14.50 + 5% (or 0.73) = 15.23

15.23 + 20% (or 3.05) = 18.28

5 0
3 years ago
What is the diameter of 80
Trava [24]
What do you mean? just the number 80?
8 0
3 years ago
Read 2 more answers
Decide if the situation involves a permutation... anyone?
ehidna [41]

Each medal is different and is handed out depending on the outcome of the race/order of the racers, so we're counting the number of permutations. 4 medals are given to 4 runners, so there are

4!=4\cdot3\cdot2\cdot1=24

possible ways to do it.

4 0
3 years ago
The mayor is interested in finding a 98% confidence interval for the mean number of pounds of trash per person per week that is
saul85 [17]

Solution :

Given :

Sample mean, $\overline X = 34.2$

Sample size, n = 129

Sample standard deviation, s = 8.2

a. Since the population standard deviation is unknown, therefore, we use the t-distribution.

b. Now for 95% confidence level,

   α = 0.05, α/2 = 0.025

  From the t tables, T.INV.2T(α, degree of freedom), we find the t value as

  t =T.INV.2T(0.05, 128) = 2.34

  Taking the positive value of t, we get  

  Confidence interval is ,

  $\overline X \pm t \times \frac{s}{\sqrt n}$

 $34.2 \pm 2.34 \times \frac{8.2}{\sqrt {129}}$

 (32.52, 35.8)

 95% confidence interval is  (32.52, 35.8)

So with $95 \%$ confidence of the population of the mean number of the pounds per person per week is between 32.52 pounds and 35.8 pounds.

c. About $95 \%$ of confidence intervals which contains the true population of mean number of the pounds of the trash that is generated per person per week and about $5 \%$ that doe not contain the true population of mean number of the pounds of trashes generated by per person per week.  

4 0
2 years ago
Other questions:
  • How do I do orders of operations
    13·2 answers
  • (6-7)[4-6]^2+2(-4)-2]
    15·1 answer
  • Suppose m:angle a =77 degrees what is the measure of a complement of a complement of angle a
    5·1 answer
  • Bella saw that 7:11 people brought an umbella to the beach. There were 99 peopel there. How many of them did not have a beach um
    10·1 answer
  • How to graph y=-13x-5
    9·1 answer
  • Tina painted 1/2 of a bedroom in 3/4 a day. How many days will it take dor Tina to paint one bedroom ​
    9·1 answer
  • a jar contains 32 red marbles and 28 blue marbles. what is the probability that a randomly selected marble is red
    13·1 answer
  • I Need Help With This One
    12·1 answer
  • HELP PLEASE 10 POINTS
    14·2 answers
  • Please help thank u I appreciate it
    6·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!