Round 82736 to 1 significant figure

80000

Step-by-step explanation:

Here, we want to write the number in one significant figure

What we have to do here is to simply turn the numbers after 8 to zero

This is because the first number is less than 5

So we have the significant figure as 80000

answer: 8 years

step-by-step explanation:

the explanation is that in 8 years the child will be 20 and in 8 years the father will be 40 and 20 is half of 40.