My Neurons Love Me For Exercising Them
Last Problem:
A snail is at the bottom of a 20 meters deep pit. Every day the snail climbs 5 meters upwards, but at night it slides 4 meters back downwards. How many days does it take before the snail reaches the top of the pit?
Answer:
16 days. Since the snail moves up 1 meter a day so it will reach 15 meters in 15 days. next day it will again climb 5 meters upward and reaches the top.
Today’s Mind Puzzle:
I come once in a day, twice in a hour and three times in a minute. What am I?
Last Problem:
In the middle of a round pool lies a beautiful water-lily. The water-lily doubles in size every day. After exactly 20 days the complete pool will be covered by the lily. After how many days will half of the pool be covered by the water lily?
Answer:
19 days. Since the water-lily doubles its size every day and the complete pool is covered after 20 days, half of the pool will be covered one day before that, so 19 days.
Today’s Problem:
A snail is at the bottom of a 20 meters deep pit. Every day the snail climbs 5 meters upwards, but at night it slides 4 meters back downwards. How many days does it take before the snail reaches the top of the pit?
Last Math Problem:
The difference between a two-digit number and the number obtained by interchanging the positions of its digits is 36. What is the difference between the two digits of that number?
Answer:
The difference between the two digits of that number is 4.
Explanation: Let the ten’s digit be x and the unit’s digit be y. According to the explanation above, (10x+y)-(10y+x) = 36
To solve: 10x-10y+y-x = -9y+9x = 9(x-y) = 36
This results in the solution: the difference between the two digits (x-y) is 4.
Today’s Problem:
In the middle of a round pool lies a beautiful water-lily. The water-lily doubles in size every day. After exactly 20 days the complete pool will be covered by the lily. After how many days will half of the pool be covered by the water lily?
Yesterday’s Problem:
The sum of ages of 5 children born at the intervals of 3 years each is 50 years. What is the age of the youngest child?
Answer:
4 Years.
Explanation: Let the age of the youngest child be x: The ages of the five children are thus: x, (x + 3), (x + 6), (x + 9) and (x + 12) years. This means:
x + (x + 3) + (x + 6) + (x + 9) + (x + 12) = 50
To solve: 5x = 20 and x = 4.
The youngest child (x) is thus 4 years old.
Today’s Math Problem:
The difference between a two-digit number and the number obtained by interchanging the positions of its digits is 36. What is the difference between the two digits of that number?
Remember: It really does not matter whether you solve this correctly. Simply thinking through possible solutions creates new neural networks – and that is the point of these mind exercises.
Yesterday’s Mind Puzzle:
If 5+3+2 = 151012, 9+2+4 = 183662, 8+6+3 = 482466, 5+4+5 = 202504 then what will be the answer of 7+2+5?
Only 2% people are able to solve this aptitude question.
Answer:
7 + 2 + 5 = 143542.
Explanation: a + b + c leads to a 6-digit number.
The first and second digits are the product of a and b.
The third and fourth digits are the product of a and c.
The fifth and sixth digits are b*(a+c) with the digits of the solution reversed.
Today’s Math Problem:
The sum of ages of 5 children born at the intervals of 3 years each is 50 years. What is the age of the youngest child?
Last Problem:
You have to measure exactly 4 liters of water, but you only have a 3-liter bottle and a 5-liter bottle. How do you do it?
Answer:
Fill the 3-liter bottle and pour it into the empty 5-liter bottle. Fill the 3-liter bottle again, and pour enough to fill 5-liter bottle. This leaves exactly 1 liter in the 3-liter bottle. Empty the 5-liter bottle; pour the remaining 1 liter from the 3-liter bottle into the 5-liter bottle. Fill the 3-liter bottle and pour it into the 5-liter bottle. The 5-liter bottle now contains 4 liters.
Today’s Mind Puzzle:
If 5+3+2 = 151012, 9+2+4 = 183662, 8+6+3 = 482466, 5+4+5 = 202504 then what will be the answer of 7+2+5?
Only 2% people are able to solve this aptitude question.