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If $8\theta 12\delta 6 = 60$ and $13\theta 15\delta11 = 74$ , then $18\theta 21\delta 15 $= ?
- A161
- B139
- C153
- D147
Answer not set
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0
CCommunity
139 : option 3 is the correct answer
0
CCommunity
The concept is:
8*12- (6*6)= 30
13*15- (11*11)= 74
thus, 18*21- (15*15)= 153
correct answer is 153
8*12- (6*6)= 30
13*15- (11*11)= 74
thus, 18*21- (15*15)= 153
correct answer is 153