Question

Use mathematical relation between the numbers in the first three stars to find the missing numbers in fourth and fifth stars.
Fourth
Fifth

• A. $c=-7$ and $d=-9$
• B. $c=7$ and $d=5$
• C. $a=-75$ and $b=-20$
• D. $a=75$ and $b=20$

Answer 1

Answer: (A), (D)

$a=75$ and $b=20$

The numbers in the first three stars follows the relation,
For the fourth star W = $15$ and E = $5$
As per the relation,

• The number in the top = $\text{W}\times \text{E}=15\times 5=75$

$\Rightarrow a=75$

• The number in the bottom = $\text{W}+\text{E}=15+5=20$

$\Rightarrow b=20$

For the fifth star W = $Unknown$ and E = $-2$
As per the relation,

• The number in the top = $\text{W}\times \text{E}=14$

$\Rightarrow$ W$\times (-2)=14$ $\Rightarrow$ W $=-7$
$\Rightarrow c=-7$

• The number in the bottom = $\text{W}+\text{E}=(-7)+(-2)=-9$

$\Rightarrow d=-9$