Linear Equations In One Variable
Class 8 Maths
Q & A based on Class 8 NCERT Chapter
Q1(MCQ): If 3x – 4 (64 – x) = 10, then the value of x is
(a) –266
(b) 133
(c) 66.5
(d) 38
Answer: (d)38
3x - 256 + 4x =10
7x = 10 + 256 = 266
x = 266/7 = 38
Q2: Three consecutive even numbers whose sum is 156 are 51, 52 and 53.
State if the above statement is True or False
Answer: False
Let the three consecutive even numbers be x, x+2, x+4
∴ x + x+ 2 + x+4 = 156
⇒ 3x + 6 = 156
⇒ 3x = 156 - 6 = 150
⇒ x = 150 / 3 = 50
Thus numbers are 50, 51, 52
Q3: Fifteen added to thrice a whole number gives 93. The number is __________.
Answer: 26
Q4: x = –12 is the solution of the linear equation 5x –3(2x + 1) = 21+x (True or False)