What's the sum of 2/5 and 2/4
a 6/7
b 9/10
c 10/20
d 8/10

The sum of these consecutive integers is equal to 9 less than 4 times the least of the integer. find the three integers

Tom can paint the fence in 12 hours, but if he works together with a friend they can finish the job in 8 hours. how long would it take for his friend to paint this fence alone?

Tom drove 206 miles in 3.9 hours. estimate his average speed.