Question

the total cost of 2 similar television and 5 similar washing machine is 7215 dollar. Each washing machine cost 216 dollar less than a,television. How much do 3 television cost?
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Answer 1

Answer:

$ 2629.2

Step-by-step explanation:

Let cost of television be 'x' and washing machine be 'y'

A.T.Q,

2x+5y=$ 7215----(i)

=> y=$ 216+x

=> y-x=$ 216-----(ii)

Multiplying equation (ii) with 2 we get,

2y-2x=$ 432-----(iii)

Now,

Subtracting equations (i) and (iii) we get,

2x+5y=$7215

2y-2x=$432

—————

5y+2y=$7647

y=$1092.4

putting y in eq (ii) we get,

$1092.4-$216=x

x=$876.4

So, cost of 3 televisions are $2629.2 (Ans)

Answer 2

Answer:

2x+5y=7215

2x+5 (×+216)=7215

2x+5x+1080=7215

7x=7215-1080

7×=6135

×=6135÷7

×=876.4

876.4×3= 2629.2