5 x 0.25 x 6.301 x 0.00394=?

Correct Answer: 0.09724

Explanation:

9.724 ÷ 100 = 0.09724
Shift decimal two palaces to the left. i.e 100

Correct Answer: 0.045388

Explanation:

Multiplying 3.242 x 14=4.5388
Now divide 4.5388 by 100
So, 4.5388 ÷ 100= 0.045388
? Shift the decimal two places to the left as 100

Correct Answer: 7.43673

Explanation:

For the product of 3.5413 x 2.1
Consider 35413 x 21 = 743673
Total decimal places = 4 + 1
? 3.5413 x 2.1=7.43673

Correct Answer: 60.658

Explanation:

51.300 + 7.078 + 1.380 + 0.900 = 60.658

Correct Answer: 2b/a

Explanation:

Given in question,
x + a/x = b
? ( x² + a )/x = b
? x² + a = bx .........................(i)
? bx - x² = a .........................(ii)
Now Given in question,
( x² + bx + a ) / ( bx² - x³ )
? ( x² + a + bx ) / ( bx² - x³ )
Put the value of x² + a from equation (i) in above equation,
? ( bx + bx )/(bx² - x³)
= (2bx)/( bx² - x³ )
= (2bx)/x( bx - x² )
= 2b/(bx - x²)
Put the value of bx - x² from equation (ii) in above equation, we will get
= 2b/a

Correct Answer: .0005

Explanation:

Let 0.8y = 0.0004
Then,y = 0.0004 / 0.8
= 0.004 / 8
= .0005

Correct Answer: 0.00072

Explanation:

? 9 x 8=72
? 0.09 x 0.008 = 0.00072 (Five place of decimal )

Correct Answer: 300

Explanation:

Let k % of 10.8=32.4
⇒ (k x 10.8) / 100 = 32.4
⇒ k = (32.4 x 100 )/10.8
= 300

Correct Answer: 2

Explanation:

Let k / .0025=800
Then, k = 800 x .0025
= ( 800 x 25 ) / 10000
= 2

Correct Answer: .1

Explanation:

Let 0.001 / x = 0.01
Then , x = 0.001 / 0.01
= 0.001 / 0.010
= 1 / 10
= 0.1