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self Math Questions and Answer Page 322

(#M40001469) SELF QUESTION simple logic but little difficult? Keep an EYE

6+3+2 = 242116
8+9+1 = 727216
5+7+4 = 505644
2+7+5 = Who am I?

ULAGUNATHAN (14 years ago)

Solved Dr.Dipin Singh Read Solution (3)

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(#M40001467) SELF QUESTION Keep an EYE

I am thinking of a 6-digit number. The sum of the digits is 43.

And only two of the following three statements about the number are true:

(1) it's a square number,
(2) it's a cube number, and
(3) the number is under 500000.

Karthick Babu (14 years ago)

Unsolved Read Solution (3)

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(#M40001466) SELF QUESTION Keep an EYE

A bridge will collapse in 17 minutes.

4 people want to cross it before it will collapse. It is a dark night and there is only one torch between them.

Only two people can cross at a time.

"A" takes a minute to cross.
"B" takes 2 minutes.
"C" takes 5
and "D" takes 10 minutes

How do they all cross before the bridge collapses?

Karthick Babu (14 years ago)

Solved sanjeev Read Solution (5)

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(#M40001465) SELF QUESTION Keep an EYE

A solid, four-inch cube of wood is coated with blue paint on all six sides.
Then the cube is cut into smaller one-inch cubes.

These new one-inch cubes will have either three blue sides, two blue sides, one blue side, or no blue sides. How many of each will there be?

Karthick Babu (14 years ago)

Unsolved Read Solution (3)

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(#M40001463) SELF QUESTION Wonder of Maths Keep an EYE

1*8+1=9
12*8+2=98
123*8+3=987
1234*8+4=9876
12345*8+5=98765
123456*8+6=987654
1234567*8+7=9876543
12345678*8+8=98765432
123456789*8+9=987654321

Solution

This is not a question but is a good arrangement of integers. Thanks for giving this in ours site

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ULAGUNATHAN (14 years ago)

Solved

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(#M40001420) SELF QUESTION simple math equations Keep an EYE

there are two equations-
sqrt(x)+y=11.
x+sqrt(y)=7.
both the equations are satisfied witn x=4 & y=9...
I want to know how will it calculate.

Solution

sqrt(x)+y=11, sqrt(y)+x=7
on subtracting we find [sqrt(x)-sqrt(y)]-[x-y]=4
or [sqrt(x)-sqrt(y)][1-sqrt(x)-sqrt(y)]=4
on putting the value of sqrt(y) from second equation, we find
[x+sqrt(x)-7][x-sqrt(x)-6]=4
or x^2-14x+sqrt(x)+38=0
or [x^2-4x]-[10x-sqrt(x)-38]=0
or x[sqrt(x)+2][sqrt(x)-2]-[sqrt(x)-2][10x-19]=0
or sqrt(x)-2=0
or x=4

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Neeraj Gupta (14 years ago)

Solved

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(#M40001414) SELF QUESTION Keep an EYE

3, 12, 7, 26, 15, ?

ganesh mohanty (14 years ago)

Solved Gaurav Singh Read Solution (13)

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(#M40001412) SELF QUESTION Keep an EYE

The entrance ticket at the Inox theatre in Chennai is worth Rs 250. The sale of tickets increased by 50% when the price of the ticket was lowered. However, the collections recorded a decrease of 17.5%. The price of the ticket is reduced by how much rupees?

(a)Rs150 (b)Rs112.50 (c)Rs105 (d)Rs120

Solution

Let total tickets sold = x
When sale increases, total tickets sold = 1.5x
Previous cost of the ticket = 250
New cost after the reduction in the cost = 250-y
According to the given condition
1.5x(250-y)/250x = 82.5/100
or y = 112.5

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suneil (14 years ago)

Solved Abhishek Divakar Read Solution (1)

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(#M40001411) SELF QUESTION Keep an EYE

A number is mistakenly divided by 5 instead of being multiplied by 5. Find the percentage change in the result due t this mistake.

(a)96% (b)95% (c)2400% (d)200%

suneil (14 years ago)

Solved Divyanand Read Solution (6)

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(#M40001410) SELF QUESTION Keep an EYE

A school having four classes only have student strength of 10, 20, 30 and 40 respectively. The pass percentages of these classes are 20%, 30%, 60% and 100% respectively. What is the pass percentage for the entire school?

(a)56% (b)76% (c)34% (d)66%

suneil (14 years ago)

Solved Divyanand Read Solution (8)

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