Question

If $a\times b=2a-3b+ab$, then $3\times 5+5\times 3$ is equal to

• A. $22$
• B. $24$
• C. $26$
• D. $28$

Answer 1

The correct option is A $22$

$a\times b=2a-3b+ab$

find $3\times 5+5\times 3$

$3\times 5[a=3,b=5]$

$\therefore 3\times 5=2\left(3\right)-3\left(5\right)+3\left(5\right)$

$3\times 5=6$

$5\times 3[a=5,b=3]$

$\therefore 5\times 3=2\left(5\right)-3\left(3\right)+\left(5\right)\left(3\right)$

$=10-9+15$

$5\times 3=16$

$\therefore 3\times 5+5\times 3=6+16$

$3\times 5+5\times 3=22$