Question

If $324\times 150=54$, $251\times 402=48$, $523\times 246=120$, then $651\times 345$ is equal to

• A. 120
• B. 85
• C. 144
• D. 60

Answer 1

Answer: (C)

144

I. $324\times 150=54$
$\Rightarrow (3+2+4)\times (1+5+0)=9\times 6=54$
II. $251\times 402=48$
$\Rightarrow (2+5+1)\times (4+0+2)=8\times 6=48$
III. $523\times 246=120$
$\Rightarrow (5+2+3)\times (2+4+6)=10\times 12=120$
Similarly, $651\times 345=144$
$\Rightarrow (6+5+1)\times (3+4+5)=12\times 12=144$