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Q.

Daniel needs to make 16 flags for a school play. If he used $\frac{2}{5}$ of material to make these flags, then how many flags will be made, if he uses the remaining material as well?

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a

16

b

20

c

24

d

27

answer is C.

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Detailed Solution

Number of flags made by $\frac{2}{5}$ of material = 16
Number of flags made by 1 of material $= 16 \times \frac{5}{2}$
Number of flags made by $(1 - \frac{2}{5})$ of material
$\begin{array}{l} = 16 \times \frac{5}{2} \times \frac{3}{5} [∴ 1 - \frac{2}{5} = \frac{3}{5}] \\ = 24 \end{array}$

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