A grocer has two kinds of candies: one sells for 90 cents per pound and the other sells for 40 cents per pound. How many pounds of each kind must he use to make 50 pounds he can sell for 85 cents per pound?

Please help! :(

Given:

Candy x = 0.90 per pound 

Candy y = 0.40 per pound

100 pounds * 0.85 per pound = 85

x + y = 100

0.90x + 0.40y = 85

x = 100 - y

0.90(100 - y) + 0.40y = 85

90 - 0.90y + 0.40y = 85

-0.50y = 85 - 90

y = -5 / -0.50

y = 10

x = 100 - y

x = 100 - 10

x = 90

0.90x + 0.40y = 85

0.90(90) + 0.40(10) = 85

81 + 4 = 85

85 = 85

line or a linear equation graph

step-by-step explanation:

step-by-step explanation:

the original amount doesn't ''re just looking for the time it takes for 1/2 of the substance to we have

(1/2) =)     take the ln   of both sides

ln (1/2)   = )   and we can write

ln(1/2) = ) lne     and lne   = 1     so we have

ln(1/2) = -.1092t     divide both sides by -.1092

t = ln(1/2)/-.1092 = about 6.347 days = about 6.3 days (rounded)