Nick spent $1141 on sweaters and shirts. The number of shirts he bought was ¹₂ the number of sweaters he bought. The cost of a shirt was $7 more than the cost of a sweater. He paid $315 more on sweaters than on shirts. Find the cost of 9 sweaters and 3 shirts.

	Sweaters	Shirts
Number of sets	2 sets	1 set
Compare each		$7 more
Total value	$728	$413

Total cost of shirts
= (1141 - 315) ÷ 2
= $413

Total cost of sweaters
= 413 + 315
= $728

2 sets of sweaters = $728
1 set of sweaters = 728 ÷ 2 = $364 

1 set of shirts = $413

Difference in 1 set of shirts and 1 set of sweaters
= 413 - 364
= $49

Number of clothing in 1 set
= 49 ÷ 7
= 7

Cost of 1 sweater
= 364 ÷ 7
= $52

Cost of 1 shirt
= 52 + 7
= $59

Price of 9 sweaters and 3 shirts
= (9 x 52) + (3 x 59)
= 468 + 177
= $645

Answer(s): $645