Master relief package was sent to a storm ravaged area of the country. The package contained 144 pounds of sanitation kits and canned goods. The canned goods weighed 6 pounds each and the sanitation kits weighed 3.5 each. If k represents the number of sanitation kits and c represents the number canned goods, then the total can be represented by the equation 3.5k + 6c = 144, if the package contained 10 canned goods, how many sanitation kits were included?
a) 20
b) 30
c) 40
d) 50