Hello,
Let's x the ones digits
2x is the tens digit
Number is 2x*10+x
Sum of digits is 2x+x=12
==>3x=12
==>x=4
Number is 84
Answer:
a) 8 hours
Step-by-step explanation:
h = # hours worked
240 = .05(3200) + 10h
240 = 160 + 10h
80 = 10h
8 = h
C = pi * d
452.16 = 3.14 * d
Divide both sides by 3.14
144 = d
Answer:
6.1538
Step-by-step explanation:
2 pumps remove 1300 gallons
1 pump remove 1300÷2= 650 gallon
the goal is 4000 gallons
4000÷ 650= 6.1538 pumps