Question

B. 75%
C. 45%
D. 85%
72% of 25 students are good in mathematics. How many are not good in Mathematics?
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Answer 1

18 students are not good in maths

Answer 2

Answer :

28% of 25 students are not good in Mathematics

Solution :

$72\% \: \: of \: \: 25 \: students \: \: are \\ good \: \: in \: \: Mathematics \\ ⟹ \: \frac{_{18 \: \: } \cancel{72}}{_{_{1 \: \: } \cancel{4} \: \: } \cancel{100}} \times \cancel{25}_{ \: \: 1} \\ ⟹ \: \underline{ \underline{18 \: \: students}} \\ \\ The \: \: students \: \: who \: \: are \: \: not \\ good \: \: in \: \: Mathematics \\ ⟹ \: 100 - 72\% = 28\% \\ ⟹ \frac{ _{7 \: \: }\cancel{28}}{ _{ _{1 \: \: }\cancel{4} \: \: }\cancel{100}} \times \cancel{25}_{ \: \: 1} \\ ⟹ \: \underline{ \underline{7 \: \: students}}$