Look at the given equations and find the missing number.

If,

2 x 3 = 18

3 x 4 = 72

Then;

4 x 5 = ?

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Solving, what comes next in the Sequence riddles are good to improve your logical reasoning skills. Solve them regularly to increase your mind power.

2*3 =2*3=6*3=18

3*4=12*6=72

4*5=20*9=180

2×2+3×3/2=18

3×3+4×4/2=72

4×4+5×5/2=200

180

200

100

90

120

81