Vivian had a total of 2580 Lego blocks packed into three boxes, A, B and C. The number of Lego blocks in Box A to that in Box B to that in Box C was 3 : 7 : 5. Vivian gave away 396 Lego blocks from Box B and some Lego blocks in Box C. The number of Lego blocks left in Box C was 1/4 of the number of Lego blocks left in Box B. How many Lego blocks from Box C did she away
Vivian had a total of 2580 Lego blocks packed into three boxes, A, B, and C. The number of Lego blocks in Box A to that in Box B to that in Box C was 3 : 7 : 5. Vivian gave away 396 Lego blocks from Box B and some Lego blocks in Box C. The number of Lego blocks left in Box C was 1/4 of the number of Lego blocks left in Box B. How many Lego blocks from Box C did she give away?
A : B : C = 3 : 7 : 5 = 516 : 1204 : 860
1204 - 396 = 808 (number of bloks left in box B)
808 / 4 = 202 (number of blocks left in box C)
860 - 202 = 658 (number of blocks she gave away from box C)
