Question

Can u plz help me with this question step by step

Answer 1

A little bit problem to understand some letters that's why I put x instead of your word.....

${72}^{0} = \frac{x}{1440} \times {360}^{0}$

${72}^{0} = \frac{x}{144} \times {36}^{0}$

$\frac{ {72}^{0} }{ {36}^{0} } = \frac{x}{144}$

$2 \times 144 = x \: \: answer$

Or you may Also solve it as follow;

$x\% + 10\% + 70\% = 100\% \\ x\% + 80\% = 100\% \\ x\% = 100\% - 80\% \\x\% = 20\% \\ number \: of \: pupils = 20\% \: of \: total \: pupils \\ = \frac{20}{100} \times 1440 \\ = 2 \times 144 \\ = 288$

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