In the patter we observe $$\ \frac{product\ of\ number\ in\ traigle\ }{product\ of\ number\ in\ sqaure\ and\ circle}\ =\ \ \frac{\ 6\times\ 8}{12\times\ 8}=\ \frac{\ 5\times\ 6}{6\times\ 10}=\ \frac{\ 1}{2}$$
Let the missing number be $$N$$
$$\ \frac{\ 3\times\ 12}{4\times\ N}=\ \frac{\ 1}{2}$$
$$N=18$$
Create a FREE account and get: