IKMC 2027 - Grades 7-8 - Self-study SET 11 - Thematic Batch 3 Question 5

Question 5

If $\frac ab=\frac cd$ and $c\ne0$, which expression below is not true?

Interpret the question as asking which formula does not follow in general.

Question illustration

$\frac ba=\frac dc$
$a^2d^2=b^2c^2$
$\frac ac=\frac bd$
$\frac ad=\frac bc$
$\frac{a+b}{b}=\frac{c+d}{d}$