Question

4 students blink their eyes in each 3 sec,4 sec,6 sec and 8 sec. respectively. within 60 sec how many times will the blink their eyes all together??​

Answer 1

For the student with 3 seconds

60/3=20 times

For 4 seconds:60/4=15 times

For 6 seconds:60/6=10 times

For 8 seconds:60/8=7 times

So sum of all =20+15+10+7

=52 times

Answer 2

$number \: of \: students \: = 4 \\ number \: of \: seconds \: = 60 \\ \\ for \: a \: student \: which \: blink \: in \: each \: 3 \: seconds \\= \: 60 \div 3 = 20 \\ for \: a \: student \: which \: blink \: in \: each \: 4 \: seconds \\= 60 \div 4 = 15 \\for \: a \: student \: which \: blink \: in \: each \: 6 \: seconds \\= 60 \div 6 = 10 \\for \: a \: student \: which \: blink \: in \: each \: 8 \: seconds \\= 60 \div 8 = 7app.\\total \: number \: of \: blinks \: in \: 60 \: second = 20 + 15 + 10 + 7 = 52app.$