Maths Riddles

7 Trips

Send 2+5+9 = 16
Bring back 9
Send 3+4+9 = 16
Bring back 9
Send 1+7+8 = 16
Bring back 1
Send 1+6+9 = 16

reporters=2, camera-man=5 and the writers=13

Let the number of reporters, camera-man, and writers are denoted by r, c, and m respectively.

From the given information we can write the following 2 equations;
r + c + m = 20 . . . . . . (1)
3r + 1.5c + 0.5m = 20 . . . . . (2)

Multiplying equation (2) by 2 we get;
6r + 3c + m = 40 . . . . . (2)

equation3 - equation 1
5r + 2c = 20

The unique solution with whole numbers is r = 2 & c = 5

Therefore from equation(1) we can find;
m = 13

=> reporters=2, camera-man=5 and the writers=13

==== 65 ==== 35 ====
== 34 === 31 === 4 ==
= 10 == 24 == 7 == -3 =

40 or 96

Explanation:
Solution A :
Add the rhs of the last line to the current line
1 + 4 = 5
5 + 2 + 5 = 12
12 + 3 + 6 = 21
21 + 8 + 11 = 40

Solution B :
RHS = 1ST NUMBER + (1ST NUMBER * 2ND NUMBER)
1 + (1 x 4) = 5
2 + (2 x 5) = 12
3 + (3 x 6) = 21
8 + (8 x 11) = 96

The Solution is stated in the image below.

25

First Equation
1Red-Flower + 1Red-Flower + 1Red-Flower = 60
Hence, 1Red-Flower = 20

Second Equation
Red-Flower + 5Blue-Petals + 5Blue-Petals = 30
20 + 10Blue-Petals = 30
10Blue-Petals = 10
Hence 1Blue-Petals = 1

Third Equation
5Blue-Petals + 2Yellow-Flower = 3
5 + 2Yellow-Flower = 3
2Yellow-Flower = 2
Hence, 1Yellow-Flower = 1

Required
Yellow-Flower + Red-Flower + 4Blue-Petals = ?
Hence, 1 + 20 + 4 = 25

12111
11000 + 1100 + 11 => 12111

$2000

Explanation:
Profit from 1st transaction = $1000 (13000-12000)
Profit from 2nd transaction = $1000 (15000-14000)

So the overall profit will be = $2000.

4.

The 1st picture has 9 connecting dots / crossed lines.
The 2nd picture has one connecting dot / crossed line.
The last picture has 4 connecting dots / crossed lines.

100.

For a detailed explanation, please watch the video.