In a school excursion, $6$ teachers and $12$ students from $6\mathrm{th}$ standard and $9$ teachers and $27$ students from $7\mathrm{th}$ standard, $4$ teachers and $16$ students from $8\mathrm{th}$ standard took part. Which class has the least teacher to student ratio?

If the ratio of Green, Yellow and Black balls in a bag is $4:3:5$, then

Which is the most likely ball that you can choose from the bag?

If the ratio of Green, Yellow and Black balls in a bag is $4:3:5$, then

How many balls in total are there in the bag if you have $40$ black balls in it?

If the ratio of Green, Yellow and Black balls in a bag is $4:3:5$, then

How many balls in total are there in the bag if you have $40$ black balls in it?

Find the number of green and yellow balls in the bag.