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For every 18 eggs that Noori buys, three eggs turn out to be rotten. At the same rate, how many good eggs will Noori have if she buys 690 eggs?

For every 18 eggs that Noori buys, three eggs turn out to be rotten. At the same rate, how many good eggs will Noori have if she buys 690 eggs? Correct Answer 575

Given:

For every 18 eggs, 3 are rotten.

Calculations:

3 eggs are rotten & 15 eggs are good (given)

Rotten eggs : Good eggs = 3 : 15 = 1 : 5

Good eggs = 5/6 of all eggs

Good eggs = (5/6) of 690

⇒ 575 eggs

∴ The correct choice will be option 4.

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