SOLUTION: The price of blue socks is twice the price of black socks. If John buys 20 pairs of black socks and 30 pairs of blue socks he pays $120. How much does one pair of blue socks cost ?

Question 279154: The price of blue socks is twice the price of black socks. If John buys 20 pairs of black socks and 30 pairs of blue socks he pays $120. How much does one pair of blue socks cost ?
(A) $1.50 (B) $3.00 (C) $4.50 (D) $1.00 (E) none of these
Answer by mananth(16946) (Show Source): You can put this solution on YOUR website!
The price of blue socks is twice the price of black socks. If John buys 20 pairs of black socks and 30 pairs of blue socks he pays $120. How much does one pair of blue socks cost ?
(A) $1.50 (B) $3.00 (C) $4.50 (D) $1.00 (E) none of these
let cost of black socks be x
So blue socks will be 2x
20x+30*2x=120
20x+60x=120
80x=120
x=120/80
$1.5 black socks
$3 will be the cost of blue socks
RELATED QUESTIONS
8.You randomly pick a pair of socks from the drawer, which contains 2 pairs of BLUE... (answered by jorel555)

Vera has 20 white socks, 21 black socks, 22 brown socks, 23 blue socks, 24 red socks, and (answered by CPhill,ikleyn)

Bethany sock drawer contains 8 blue and 5 black socks. If she randomly pulls out one... (answered by Alan3354)

John has two pairs of shoes , one black , and the other brown. he has three pairs of... (answered by Fombitz)

A sock drawer contains 6 socks, 3 of which are definitely blue and the other 3 of which... (answered by solver91311)

A man has 11 pairs of socks in his sock drawer: 3 brown, 6 black, and 2 blue. a): if the (answered by jim_thompson5910)

A drawer contains 18 black socks comma 18 white socks comma and 18 blue socks18 black... (answered by ikleyn)

In your sock drawer, there are 30 black socks, 12 white socks, and 20 brown socks. To the (answered by flame8855)

In your sock drawer , there are 30 black socks, 12 white socks, and 20 brown socks. To... (answered by lynnlo)