Question

a lift has the capacity of 18 adults or 30 children.how many children can board the lift with 12 adults?

Answer 1

1 adult=30/18 children
12 adults and more 6 adults can be accommodated
6 adults=6*(30/18)
=10 children

Answer 2

Capacity of the lift = 18 adults or 30 children

⇒ 18 adults = 30 children

Find the number of children that is equivalent to 1 adult:

18 adult = 30 children

1 adult = 30 ÷ 8 = 5/3 children

Find the remaining capacity of the lift after 12 adults have board:

Capacity remaining = 18 - 12 = 6 adults

Find the number of children equivalent to 6 adults:

1 adult = 5/3 children

6 adults = 5/3 x 6 = 10 children

Answer: 10 children can board the lift.