Some equations have been solved on the b...

Some equations have been solved on the basis of a certain system. Find the correct answer for the unsolved equation on that basis. If 9* 7 = 32, 13 * 7 = 120, 17 9 = 208, then 19 11 = ?

A

150

B

180

C

210

D

240

Text Solution

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The correct Answer is:

D

`9 + 7 = 16, 9 - 7 = 2`
`16 xx 2 = 32`
`13 + 7 = 20, 13 - 7 = 6`
` 20 xx 6 = 120`
`17 + 9 = 26, 17 - 9 = 8`
`26 xx 8 = 208`
`19 + 11 = 30 , 19 -11 = 8`
` 30 xx 8 = 240`

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Some equations have been solved on the basis of a certain system. Find the correct answer for the unsolved equation on that basis. If 9* 7 = 32, 13 * 7 = 120, 17 9 = 208, then 19 11 = ?