Lucy is knitting a blanket and needs to buy some more yarn. At her local craft store, 2 skeins of yarn cost $7 and 8 skeins of yarn cost $28. If Lucy needs 20 skeins of yarn to finish the blanket, how much money will it cost?

A.
$49
B.
$56
C.
$70
D.
$140

Question

Lucy is knitting a blanket and needs to buy some more yarn. At her local craft store, 2 skeins of yarn cost $7 and 8 skeins of yarn cost $28. If Lucy needs 20 skeins of yarn to finish the blanket, how much money will it cost?

A. 
$49
B. 
$56
C. 
$70
D. 
$140

jhonyy9 · Answer

so there given that 2 skeins of yarn cost $7 
and than you see 4 times more skeins of yarn  4*2 = 8  so 8 cost $28 what is 4 time the cost of 2 skeins what cost is $7 so 4*7 = 28

yes ?

so in this way how you can calcule the cost of 20 skeins of yarn ?