Can anyone help with how to do this sum?

[BrandNewSofa]

Anyone?

A) double the builders had the time
B) half the builders, double the time and then I'm sure you can do c)

1 builder is 6 hours

The easiest way is to work out how long it would take 1 person.

2 people is 3 hours so it is six hours work for 1 person.

So

1 person - 6 hours
2 people - 3 hours
3 people - 2 hours
4 people - 1.5 hours

Figure out how many “man hours” - it takes 6 man hours total.

Then you can divide 6 by the number of builders for a b and c

A) 2 hours, double the builders half the time
B) 6 hours, half the builders double the time
C) 2 1/2 hours, 2 builders =3 hours, 4 builders = 2 hours, midway between 2 and 4 builders and 2 and 3 hours is 2 1/2 hours

Clearly set by someone who has never built a wall :)

No way is the relationship linear.

What if one of the builders was slacking and the other one was the one putting most of the work in?

Is it a trick question??
A wall is built however long it takes.
It might just be bigger/smaller/stronger/weaker depending on the skill and number of builders.

It’s a maths question, reality doesn’t apply 😆