Question

On Saturday, 8 children made a sandcastle in 5 hours. On Sunday, two more children joined the group. How long it will take the children to build a new sandcastle on Sunday?

Answer 1

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Answer:

4 hours

Explanation:

Assuming the work involved is still ...

(8 children)(5 hours) = 40 children·hours

Then 10 children can do that amount of work in ...

(40 children·hours)/(10 children) = 4 hours

Answer 2

Given that,

On Saturday, 8 children made a sandcastle in 5 hours.

We need to find the time taken to build a new sandcastle on Sunday if two more children joined the group.

8 children = 5 h

1 child = (5/8) h

When 2 children joined the group, total no of children now are 10.

It means,

10 children =
`(5)/(8)* 10=6.25\ h`

Hence, it will take 6.25 h when 2 more children joined the group.