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10.
Mr. B drives 24.5miles to cousin. Since he drives one tenth or 1/10 of this to nephew, all we have to do is divide the distance by 10. So...
D = 2.45 miles
11.
So there are 100 sequins. In total they measure 50cm. Using ratios we see that 100:50 is a 1:1/2 equivalent. So 1 Sequin is 0.5cm. You could also get this answer by dividing 50 by 100.
