A person was asked to state his age in years. His reply was , "Take my age 3 years hence, multiply it by 3 and subtract 3 times my age 3 years ago and you will know how old I am." What was the age of the person ?

Correct Answer: 0.04

Explanation:

Given = (11.98)^2 + (0.02)^2 + 11.98 * x. 

For the given expression to be a perfecr square, we must have

11.98 * x = 2 * 11.98 * 0.02 => x = 0.04

Correct Answer: 0.018

Explanation:

In these type of fractions, the decimal moves left the number of zeroes in the divisor times. Herein the given question 18/1000, there are 3 zeros in 1000 (divisor). Hence, the quotient is 0.018.

 

The quotient of 18/1000 = 0.018.

Correct Answer: 2011

Explanation:

Suppose commodity X wil cost 40 paise more than Y after Z  years. Then,

        (4.20 + 0.40Z) - (6.30 + 0.15Z) = 0.40

=>  0.25Z = 0.40 + 2.10  => Z= 2.50/0.25 = 10

Therefore, X will cost 40 paise more than Y 10  years after 2001 . i.e in 2011

Correct Answer: 0.001

Explanation:

2 * 5 = 10. Sum of decimal places =  4.

.002  * .5 = 0.0010 = 0.001 

Correct Answer: 6

Explanation:

Sum of the decimal places = 7 .

Since  the last digit to the extreme right  wil be zero ( 5 * 4 = 20),  so there will be  6  significant digits to the right of the decimal point....

Correct Answer: 11/17, 7/11, 5/9, 8/15

Explanation:

Converting each of the given fractions into decimal form, we get

 5/9 = 0.55, 7/11 = 0.63,  8/15 = 0.533, 11/17 = 0.647

Clearly, 0.647>0.63>0.55>0.533

so , 11/17 > 7/11 > 5/9 > 8/15

Correct Answer: 3120

Explanation:

Given,  52416 312 = 168 ? 52416 168 = 312 

 

Now ,  52 . 416 0 . 0168 = 52416 16 . 8 = 52416 168 × 10 = 312 × 10 = 3120

 

 

Correct Answer: 5/3

Explanation:

Given expression =  0 . 2 × 0 . 2 × 0 . 01 0 . 1 × 0 . 1 × 0 . 02 = 0 . 04 + 0 . 01 0 . 01 + 0 . 02 = 0 . 05 0 . 03 = 5 3

Correct Answer: 0.125

Explanation:

1/8 to convert into decimal,

Find an equivalent fraction with a denominator of a power of 10.

In this case, we will use 1000.

1 8 x 125 125 = 125 1000

This can now be written as a decimal with 3 decimal places (because we have thousandths.

i.e, 0.125

 

Hence,  1 8 as a decimal = 0 . 125

Correct Answer: 0.625

Explanation:

5/8 is Nothing but to divide 5 into 8 parts.

 

 

As 5 is smaller than 8, the quotient starts with a decimal point to make 5 as 50 to be divisible by 8. (0.)

 

 

Now 50 goes for 6 times in 8 leaving a remainder 2. (0.6)

 

  

Again 2 is smaller than 8, As it already has decimal point in the quotient, now 2 becomes 20.

 

  

Now 20 goes for 2 times in 8 leaving a remainder 4. (0.62)

 

  

Again 4 is smaller than 8, As it already has decimal point in the quotient, now 4 becomes 40.

 

 

Now 40 goes for 5 times in 8 leaving a remainder 0. (0.625)

 

 

Therefore, the decimal value of  5 8 is 0.625.

 

Now find a decimal value of 11 17 and Discuss your at Discuss.