A picnic is being planned in a school for Class VII. Girls are 60% of the total number of students and are `18` in number. The picnic site is `55` `km` from the school and the transport company is charging at the rate of `"Rs 12 per km"`. The total cost of refreshments will be `"Rs 4280"`. Can you tell:
`1.`The ratio of the number of girls to the number of boys in the class?
`2.` The cost per head if two teachers are also going with the class?
`3.` If their first stop is at a place `22` `km` from the school, what per cent of the total distance of `55` `km` is this? What per cent of the distance is left to be covered?

Explanation

let total students be `x`

`60/100 xx x = 18`

`x = 30`

boys =`30-18 = 12`

(i) ratio of girls/ ratio of boys=`18/12= 3/2`

(ii) total cost =`2 xx 55 xx 12 + 4280`

`= 1320 + 4280`

`= rs 5600`

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