VeritasKarishma GMATNinja sayantanc2kHi Experts,
This is a question posted on the forum long back. It would be really helpful if get a reply for this

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Comparisons using the form as...as typically fall in the below categories:
Comparing the numbers
1. Comparison of two groups doing the same action. (My intention is: Number of Americans who buy pizza= 2*(number of Indians who buy pizza)
Different ways:
Twice as many Americans as Indians buy pizza. (or)
Twice as many Americans buy pizza as Indians. (Here " Indians do" is not mentioned. "do" is in ellipsis.)
Twice as many Americans buy pizaa as Indians do.
2. Comparison of two groups doing different actions. (My intention is: Number of Americans who buy pizza=2*(Num of Indians who buy salad)
Different ways:
Twice as many Americans buy pizza as Indians buy salad. (or)
Twice as many Americans buy pizza as Indians who buy salad. <-- is this correct?
3. Comparison of same group doing different actions. (My intention is: Number of Americans who choclate=2*(Num of Americans who buy pizza)
Different ways:
Twice as many Americans buy chocolate as buy pizza. (Here "those" is in ellipsis) (question in this thread)
Twice as many Americans buy chocolate as those who buy pizza. <--- is this correct?
Twice as many Americans buy chocolate as those that buy pizza <--- is this correct?
Comparing Likelihoods
1. Comparison of likelihood of two groups to do the same action
Different ways:
Americans are twice as likely as Indians to buy pizza. (or)
Americans are twice as likely to buy pizza as Indians. (or) (Here "do" is in ellipsis) <--- is this correct?
Americans are twice as likely to buy pizza as Indians do.
2. Comparison of likelihood of the two groups doing different actions
Different ways:
Americans are twice as likely to buy pizza as Indians are to buy salad.
3. Comparison of likelihood of the same group to do different actions
Different ways:
Americans are twice as likely to buy chocolate as to buy pizza.
Americans are twice as likely to buy chocolate as pizza. <--- is this correct?
Regards,
Ashwin