Question

Pls tell me and ans of all the questions

Answer 1

$70\%of \: 25 are \: good \: in \: \: maths \: and \: \: left \: are \: not \\ 70 \div 100 \times 25 = 18 \\ 25 - 18 = 7 \\ so \: 7 \: student \: are \: not \: good \: in \: maths$
hope it helps......

Answer 2

3). total students= 25
no. of the students that are good in mathematics = 72℅ of 25
72/100*25
18
no. of students that are not good in mathematics = 25 - 18 = 7
$total \: students \: - \: no. \: of \: students \: that \: are \: good \: in \: maths \: = \: no. \: of \: students \: that \: are \: not \: good \: in \: maths$