1.

3.2% of 500 × 2.5% of ? = 3201). 6502). 7003). 6004). 800

Answer»

Given expression,

3.2% of 500 × 2.5% of ? = 320

$(\begin{array}{L} \Rightarrow \LEFT( {\frac{{3.2}}{{100}} \times 500} \RIGHT) \times \left( {\frac{{2.5}}{{100}} \times ?} \right) = 320\\ \Rightarrow 16 \times \left( {\frac{{2.5}}{{100}} \times ?} \right) = 320\\ \Rightarrow \left( {\frac{{2.5}}{{100}} \times ?} \right) = \frac{{320}}{{16}}\\ \Rightarrow \left( {\frac{{2.5}}{{100}} \times ?} \right) = 20\\ \Rightarrow \;? = \frac{{20}}{{2.5}} \times 100 \end{array})$

⇒ ? = 800


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