Mr. thomas spent $1,600 of his savings on a television set and 2/5 of the remainder on a refrigerator. he had 1/3 of his original amount of savings left. a) what was mr. thomas's original savings? b) what was the cost of the refrigerator?

a) $3,600    b) $800

Step-by-step explanation:

a)

He had originally x amount of money.

He spent $1600 on a TV.

Now he has x - 1600.

Then he spent 2/5 of the remainder on a fridge.

He spent 2/5(x - 1600) on the fridge.

Finally he has 1/3 of x left.

original amount - TV money - fridge money = (1/3)x

x - 1600 - (2/5)(x - 1600) = (1/3)x

Multiply both sides by the LCM of the denominators: 3 * 5 = 15

15[x - 1600 - (2/5)(x - 1600)] = 15[(1/3)x]

15x - 15(1600) - (15)(2/5)(x - 1600) = 5x

15x - 24,000 - 6x - 9600 = 5x

9x - 14,400 = 5x

4x = 14,400

x = 3,600

His original savings was $3600.

b)

He started with $3,600.

He spent $1,600 on the TV. Now he has $3,600 - $1,600 = $2000.

He spent 2/5 of the remainder in the fridge. 2/5 * $2,000 = $800

The fridge cost $800.

answer: y=0 if that is what u r looking for

mrbilldoesmath!

answer: a parabola

steps:

(x-1)(x+4)   = x(x+4) - 1(x+4) = (x^2 + 4x) - (x+4)

                = x^2 +4x -x -4   = x^2 +3x -4

which is a parabola

mrb