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Bunuel
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How are you inferring "English only = 50" from statement 1: (1) 50 members speak English.

It doesn't say "only" anywhere. Am I missing something?


Dereno

In a group of 70 , each speak English or French. None = 0

We need to find : French only.

Statement 1:

(1) 50 members speak English.

Since, 50 speak English, which includes both English only, and English & French.

Total = 70 = French only + Eng & French + English only.

70 = French Only + 50

French Only = 20

Hence, Sufficient

Statement 2:

(2) 10 members speak both English and French.

As we don’t know the values of English and French speaking segment individually. We cannot find the answer.

Hence, Insufficient

Option A
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The question says every member speaks English or French does'nt it mean not English and French?
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The question says every member speaks English or French does'nt it mean not English and French?

No. It means each person speaks at least one language, not necessarily only one. Some can speak both.
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HOW THE SOLUTION IS A its not mentioned the only 50 speak english its said that 50 people speak english means 40 only speaks english and 10 both .
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HOW THE SOLUTION IS A its not mentioned the only 50 speak english its said that 50 people speak english means 40 only speaks english and 10 both .
In a group of 70, every member speaks English or French. How many members speak only French?

Total = English + French - Both
70 = English + French - Both

(1) says English = 50

So:
70 = 50 + French - Both
French - Both = 20.

The question asks "How many members speak only French?", which is exactly French - Both.

Thus, (1) is sufficient.
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