Which expression means ' $x$ less than 20'?

Class 6AlgebraAlgebra

A $x - 20$
B $20 x$
C $20 - x$
D $x + 20$

Step-by-Step Solution

x

less than 20' means take

x

away from 20, giving

20 - x

. The trap

x - 20

copies the order the letters appear in the sentence, but subtraction does not work that way — 'less than' tells you what to subtract, not what to start from.

Answer: C)

20 - x

Key idea: Evaluating an expression

To evaluate an expression, **substitute** a value for the variable and compute. If

x = 5

, then

2 x + 3

becomes

2 \times 5 + 3 = 10 + 3 = 13

. The same expression with

x = 0

gives

2 \times 0 + 3 = 3

. Practise substituting — it is the bridge between an algebraic expression and a real number.

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Which expression means 'x less than 20'?

Step-by-Step Solution

Key idea: Evaluating an expression

Master this chapter in 30 minutes a day.

More Class 6 Algebra practice

Which expression means ' $x$ less than 20'?