HELP
IT'S FORMY MATHSWATCH
KDCHEURFIHPREFUBREFRE

Find three consecutive numbers such that the sum of one-fourth the first and one-fifth the second is five less than one-seventh the third

X+y=-4 x-y=2 use elimination with adding and subtraction

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?