4 equally heavy black pearls, 1 white pearl and a piece of iron weighing 30 g are placed on a beam balance as
shown in the diagram. The beam balance is balanced.
How heavy are 6 black and 3 white pearls altogether?
(A) 100 g (B) 99 g (C) 96 g (D) 94 g (E) 90 g
(A) 100 g (B) 99 g (C) 96 g (D) 94 g (E) 90 g
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4 equally heavy black pearls, 1 white pearl and a piece of iron weighing 30 g are placed on a beam b...
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