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How old is dhoni now?

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how old is doni now

Dhoni is now two fifth of his older brother’s age and two years from now he will be half of his older brother’s age.

Two years ago, dhoni was only one-fourth the age of his older brother age at that time.
How old is dhoni now ?

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Lets assume dhoni and his older brother are x and y years old as of now.
so x = 2y/5;
and
x+2 = (y+2)/2 => 2x +4 = 2+y => 2x – 5x/2 = -2 => x/2 = 2 => x = 4
and
x-2 = (y-2)/4 => 4x – 8 = y-2 => 4x – 5x/2 = 6 => 3x/2 = 6 => x = 4
and y = 10
so dhoni is 4years old now.

How many oranges were there in the basket ?

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basket of oranges

 

You have a basket of Oranges
You gave your mom half of them and half an orange
then, you gave your dad half of whats left & half an orange,
Finally you gave your sister half of whats left & half an orange
and the basket became empty.
How many oranges were there in the basket ?


this puzzle is shared by Fun Riddles on puzzless facebook page
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As basket became empty after you gave oranges to your sister, you must be having 1 orange before it.
Now you must be having 3 oranges before you came to your dad(as you gave 1.5 + 0.5 oranges to him)
Similarly you must be having 7 oranges before you came to your mom(as you gave 3.5 + 0.5 oranges to her)

Square – Square = 9,14,12,2

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Number Puzzle #150

IMG-20160213-WA0004

Square – Square = 9

+               +
Square – Square = 14

12              2


Check your answer:-
Top Left Square

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Top Right Square

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Bottom Left Square

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Top Right Square

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4.5-(-4.5)=9
+ +
7.5 – 6.5 =14
= =
12 2

Distribute 1 to 99 in five groups

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Distribute 1 to 99 in five groups so that total of each group comes same & what is that?

Hint: you don’t really have to do much calculation, just use your brain a little bit 🙂

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This superb answer given by Amrit in comments
grp1- 1 to 9 and 90 to 99 => 1-9 twice and 10*90
grp2- 10 to 19 and 80 to 89 => 1-9 twice and 10*(10+80)
grp3- 20 to 29 and 70 to 79 => 1-9 twice and 10*(20+70)
grp4- 30 to 39 and 60 to 69 => 1-9 twice and 10*(30+60)
grp5- 40 to49 and 50 to 59 -> 1-9 twice and 10*(40+50)

What could be the dates ?

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One guy had a habit of spending the money as per the day of the month, for example he will spend $18 on 18th of the month.

Once he spent, $63 in continuous 5 days, What could be the dates ?

 

What was the first day ?

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Case 1)
lets assume all the days were of the same month, in that case
x + (x+1) + (x+2) + (x+3) + (x+4) = 63
5x = 53
x is coming out to be in decimal, which can not be

Case 2)
now the other possibility is such that month changes after some days

thus there can be few possibilities

A) x + (x+1) + (x+2) + (x+3) + 1 = 63

4x = 56 => x = 14, but 1st cant come after 17th, so it is ruled out

B) x + (x+1) + (x+2) + 1 + 2 = 63
3x = 57 => x = 19, but again 1st cant come after 21, so it is ruled out as well

C) x + (x+1) + 1 + 2 + 3 = 63
2x = 56 => x = 28, this is possible for the month with 29 days, i.e. February of leap year

so thee dates were 28,29,1,2,3

Grand Father, Father and Grand Son Ages

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One grand father
One father
One Grand Son
Sum of their ages is 140 years
Grand son’s age in month
is equal to grand fathers age in years
Grand son’s age in days
is equal to Father’s age in weeks
Now, Find out the age of all three.

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Grand son’s age in years

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Father’s age in years

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Grand father’s age in years

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Lets say G, F and S are ages of grand father, father and son in years
than
G+F+S = 140
S*12 = G
S*365 = (F*365)/7 => F = 7S
Than 12S + 7S + s = 140 => 20S = 140 => S = 7 Years
F = 49 Years
G = 84 Years

Lady, church and money math puzzle

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A lady starts from her house with some money to visit four Churches.

1. As soon as she enters Church1 her money gets doubled. She donates $100 and moves.

2. At Church2 again her money is doubled and she donates $100.

3. Her money is doubled again at Church3 and she donates $100.

4. At Church4 again her money gets doubled. She donates $100 again and returns home empty handed…

How much money she had when she started from her house???

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Money before church4: $50
Money before church 3: 150/2 = $75
Money before church 2: 175/2 = $87.5
Money before Church 1: 187.5/2 = $93.75

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