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(c) has 3 significant figures, (a) has 2 sig figs, (b) has 2 sig figs, as 190 = 1.9 x 10^2, and (d) has 2 sig figs.
To find the number that, when multiplied by 4, equals 190, you would divide 190 by 4. This gives you 47.5. So, the number you're looking for is 47.5.
190 x 100 / 12.5 = 190 x 8 = 1520
0.0625x190=11.875. 6.25% of 190 is 11.875.
divide 190 by 2.5 and there is your answer.