Bunuel wrote:
A furniture shop sells a table for $150 per piece and a chair for $85 per piece. Last fortnight it sold five more tables than chairs. If its total revenue from the sale of only tables and chairs last fortnight was $1925, what was the total number of tables and chairs that the shop sold last fortnight?
(A) 12
(B) 14
(C) 15
(D) 16
(E) 18
T = 5 + C
1,925 = 150*T + 85*C
1,925 = 150 (5+C) + 85C
1,925 = 750 + 150C + 85C
1,175 = 235C
C = 5
T = 5 + C = 5+5 = 10
T + C = 15
Answer choice C.
Another approach would be to pick from the numbers, normally I would pick C to know if I need to move to A and B or D and E
If we pick T + C = 15
We know T = C + 5
So 2C + 5 = 15
C = 5
5*85 = 425
And 10 *150 = 1,500
1,500 + 425 = 1,925.
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94% (02:30) correct 
