The average of 7 numbers is 15, that of the first three is 6 and that of the last three is 23. What is the fourth number?

Number System
The average of 7 numbers is 15, that of the first three is 6 and that of the last three is 23. What is the fourth number?

7

13

15

18

7

13

15

18

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Number System
A basket contains 5 blue, 4 green and 3 red ball. If three balls are picked at random, what is the probability that at least one is red ?

37/52

34/55

32/51

31/58

37/52

34/55

32/51

31/58

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Number System
A bag contains four red, six black and seven green balls. Three balls are drawn randomly. What is the probability that the balls drawn contain exactly two red balls ?

51/340

45/340

58/340

39/340

51/340

45/340

58/340

39/340

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Number System
?125÷5x ?=6265

1452

153

1253

124

1452

153

1253

124

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Number System
Find the average of the following set of scores 450, 1050, 12, 390, 143, 286, 550, 999

490

480

495

485

490

480

495

485

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Number System
The sum of the digits of a two-digit number is 12, and the difference between the number and the number obtained by interchanging the two digits of the number is 18. Find the number.

25

12.5

75

50

25

12.5

75

50

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Number System

Number System The average of 7 numbers is 15, that of the first three is 6 and that of the last three is 23. What is the fourth number?

Number System A basket contains 5 blue, 4 green and 3 red ball. If three balls are picked at random, what is the probability that at least one is red ?

Number System A bag contains four red, six black and seven green balls. Three balls are drawn randomly. What is the probability that the balls drawn contain exactly two red balls ?

Number System ?125÷5x ?=6265

Number System Find the average of the following set of scores 450, 1050, 12, 390, 143, 286, 550, 999

Number System The sum of the digits of a two-digit number is 12, and the difference between the number and the number obtained by interchanging the two digits of the number is 18. Find the number.

Number System
The average of 7 numbers is 15, that of the first three is 6 and that of the last three is 23. What is the fourth number?

Number System
A basket contains 5 blue, 4 green and 3 red ball. If three balls are picked at random, what is the probability that at least one is red ?

Number System
A bag contains four red, six black and seven green balls. Three balls are drawn randomly. What is the probability that the balls drawn contain exactly two red balls ?

Number System
?125÷5x ?=6265

Number System
Find the average of the following set of scores 450, 1050, 12, 390, 143, 286, 550, 999

Number System
The sum of the digits of a two-digit number is 12, and the difference between the number and the number obtained by interchanging the two digits of the number is 18. Find the number.