a2zinterviews

11.	The value of (0.137+0.098)²-(0.137 - 0.098)² / 0.137×0.098 is
	A.  0.039
	B.  0.235
	C.  0.25
	D.  4

Solution

Given expression = (a+b)² - (a-b)²/ab = 4ab/ab = 4.

12.	(7.5×7.5+3.75+2.5×2.5) is equal to
	A.  30
	B.  60
	C.  80
	D.  100

Solution

Given expression= (7.5x7.5+2×7.5×2.5+2.5×2.5)² = (a²+2ab+b²) =(a+b)² = (7.5+2.5)² = 10² = 100.

13.	The value of 3.6x0.48x2.50 / 0.12x0.09x0.5 is
	A.  80
	B.  800
	C.  8000
	D.  80000

Solution

Therefore =3.6x0.48x2.50/0.12x0.09x0.5 = 36x48x250/12x9x5 = 800.

14.	Given that 268x74= 19832, find the value of 2.68x.74.
	A.  1.9832
	B.  1.0025
	C.  1.5693
	D.  1.0266

Solution

Sum of decimals places =(2+2) = 4. Therefore, = 2.68×.74 = 1.9832.

15.	Given that 268x74= 19832, find the value of 2.68x.74.
	A.  1.9832
	B.  1.0025
	C.  1.5693
	D.  1.0266

Solution

Sum of decimals places =(2+2) = 4. Therefore, = 2.68×.74 = 1.9832.