Answer:
1/12
Step-by-step explanation:
the question is asking to subtract a from b, which is the same as asking to find a-b
answer = 5/6 - 3/4
= 10/12 - 9/12 (lowest common multiple of 6 and 4 is 12)
= 1/12
if you dont know how to find lowest common multiple by prime factorisation, you can make the common denominator 6x4 instead which is 24, so
5/6 - 3/4 = 20/24 - 18/24
=2/24 = 1/12
I think that the answer is m = -1
C is 1:10
D is 8:3 i think
Answer:
The rate charged by first mechanic per hour= x =$85
The rat charged by second mechanic per hour =y = $70
Step-by-step explanation:
Two mechanics worked on a car. The first mechanic worked for 10 hours, and the second mechanic worked for 15 hours. Together they charged a total of $1900. What was the rate charged per hour by each mechanic if the sum of the two rates was $155 per hour?
Solution
Let
x= hourly rate of the first mechanic
y= hourly rate of the second mechanic
Derive two equations to solve for the two unknowns
10x + 15y = 1900 (1)
x + y = 155 (2)
From (2)
x + y = 155
x=155-y
Substitute x=155-y into (1)
10x + 15y = 1900
10(155-y) + 15y =1900
1550 -10y + 15y =1900
5y =1900-1550
5y=350
Divide both sides by 5
y= 70
Substitute y=70 into (2)
x + y = 155
x + (70) =155
x=155 - 70
= 85
x= 85
The rate charged by first mechanic per hour= x =$85
The rat charged by second mechanic per hour =y = $70