\(D\left(20minutes;30minutes;24minutes\right)=120minutes=2hours\)

So the first time the bus drivers meet again is: \(8'00+2'00=10'00\left(am\right)\)

Choose B (10:00 am)

They have eaten: 1 + 3 = 4 (apples) // 3 + 2 = 5 (pears)

The number of pears is: \(\left(25+5-4\right):2=13\left(pears\right)\)

Choose B

5 o'clock in the afternoon = 17'00

8 o'clock in the morning = 8'00

Time in San Francisco is earlier than Madrid: \(17'00-8'00=9\left(hours\right)\)

9 o'clock evening yesterday = 21'00 yesterday.

The time in Madrid that moment: \(21'00+9'00=30'00\left(=6'00today\right)\)

So the time in Madrid that moment is: 6'00 today.

There are: \(\left(25-1\right)-2+1=23\left(rows\right)\) not calculated row 13 (not avalable) and row 15.

So there are: \(23\cdot6+4=142\left(seats\right)\) for passengers on the plane.

Choose D

There are 9 different letters: V,I,A,T,K,N,G,R,O.

Because different letters to be coloured differently and same letters colored identically, there will be 9 colours he need.

Choose C

18 boys given their hands to a girl => 40 - 18 = 22 boys given their hands to a boy. => 22 boys give their left and to a boy. So 40 - 22 = 18 boys given their left hands to a girl.

Choose A

The question can change to: If the two positive integers' sum is 15, [...]

The numbers are: 7 and 8 satisfy the question.

The maximum of their product is: \(7\cdot8=56\)

The answer is A) 3.

Every time you move, you need to change by 1. To get from 3-9, you must step through 7 different numbers (from 3 to 9). If you deduce 3-2-1-... you won't make to 9.

So there are 7 different numbers.

Because they always lie, then:

- Aron's stone and Bern's stone isn't the same color.

- Bern's stone and Carl's stone isn't the same color.

=> Aron's stone and Carl's stone is the same color.

- Exactly two of them own green stones

=> Aron's stone's and Carl's stone's color is green

=> Bern's stone color is red

So A is the correct answer. (Aron's stone is green)

The number of cats gone to round 2 is: 66 - 21 = 45 (cats)

The minimum number of finalists is: 45 - 32 = 13 (C)

Choose C

Because Help you solve math and I math was wrong, I will answer it:

1st way of help you solve math was right.

2nd way: 

= (20+80) + (30+70) + (40+60) + (50+10)

= 100 + 100 + 100 + 60

= 300 + 60 = 360.

The even number between 20 and 30 have 4 numbers (22;24;26;28) divisible by 2.

The number 25 divisible by 5.

So there is 5 numbers (D) satisfy the property.

The time he took the fourth pill from the first pill is: \(15\cdot\left(4-1\right)=45\left(minutes\right)\)

So the time he took the fourth pill is: 11,05 + 0,45 = 11,50.

So he took the fourth pill at: 11,50.

My answer is: C. 7

In the picture: Nathalie miss 0 cube at the bottom, 2 cubes at the middle and 5 cubes at the top. So she need: 0 + 2 + 5 = 7 (cubes) to complete her cube.

Convert: half an hour -> 30 minutes.

The time Max eat 6 scoops is: \(30-\left(18:6\right)=10\left(minutes\right)\)

30 minutes is further than 10 minutes: 30 : 10 = 3(times)

So the total they eat is: \(18+\left(4\cdot3\right)+\left(5\cdot3\right)=18+12+15=45\left(scoops\right)\)

Choose D: 45 scoops

The incorrect statement 1 + 3 + 6.2 = 16. So the differance between the incorrect and the correct statements are: 22 - 16 = 6.

So we need to add 6. Therefore, we can change 2 -> 3 so that 6.2 (12) -> 6.3 (18).

Hence, the answer is (D): 2

Their total ages in three years time is: \(31+\left(3\cdot3\right)=40\left(years\right)\)

So their total age will be is: 40 years

\(M=\dfrac{5}{7}\left(\dfrac{5}{11}+\dfrac{2}{11}-\dfrac{14}{11}\right)=\dfrac{5}{7}.\dfrac{-7}{11}=\dfrac{-5}{11}\)