6/15 and 12/18 are ratios of 2/3
Answer:
$175
Step-by-step explanation:
Equation for Price Reduction:
Original Price * Percent Remaining of Original = New Price
Plug in the given values into the equation:
Original Price * 0.8 = $140
Divide both sides by 0.8 to isolate the Original Price:
140/0.8 = 175
Answer:
$126
Step-by-step explanation:
since they divided it evenly therefore everyone paid $42 you just times that by the amount of people. there is tom, mary and sara therefore 3. 42*3=126
Answer:
x=8.499
y=0.167
Step-by-step explanation:
the equation says:x^2-9y^2=72....(1)
x+3y=9.......(2)
divide (2) from (1),it becomes:
x-3y=8
making x subject of formula,
x=8+3y....(3)
submitting (3) into (1),it becomes
(8+3y)^2-9y^2=72
64+48y=72
48y=72-64=8
y=8/48=0.167......(4)
submitting (4) into (2),it becomes
x+3(0.167)=9
x+0.501=9
x=9-0.501
x=8.499
