Sam can paint a house in 8 hours. joe can paint the same house in 4 hours. how long does it take them to paint the house together? round to 1 decimal place.

it takes themApproximately 2.7 hours to paint the house together

Step-by-step explanation:

Sam can paint a house in 8 hours. This means that sam's unit rate of working is 1/8

Joe can paint the same house in 4 hours.

This means that Joe's unit rate of working is 1/4

If they work together, it would take them lesser time because they are working simultaneously. This means that their unit rates are additive. Combining their unit rates, it becomes

1/8 + 1/4 = 3/8

Assuming that if they work together, it will take them t hours. Therefore, Their unit rate of working will be 1/t.

Therefore,

3/8 = 1/t

3t = 8

t = 8/3 = 2.667

Approximately 2.7 hours

2.7

Step-by-step explanation:

answer set (b) 0.5, 3/4 80% is in order from least to greatest.  

step-by-step explanation:

in order to compare rational numbers to each other, it is much easier if they are in the same form.   typically, the best form in which to evaluate rational numbers is in decimals.   in order to convert a percent to a decimal, you would divide the given percentage by 100.   you can also accomplish the conversion by moving the decimal point over two places to the left.   for example, the decimal value of 80% is 80/100, or 0.8.   in order to convert a fraction to a decimal, you need to divide the numerator by the denominator.   for example, 3/4 is 0.75.   so, for choice (b) 0.5 3/4 (0.75), 80% (0.8) is the only choice in which the numbers are in order from least to greatest.