How many of each did walmart sell?

Question

Walmart sells thermometers ($4) and hot-water bottles ($3). In December, Walmart’s total sales were $1,012. Customers bought 2 times as many thermometers as hot-water bottles. How many of each did Walmart sell?

Answer 1

let's say that Walmart sold x hot water bottles in Dec.

then they sold 2x thermometers in Dec.

 

2x(4) + x(3) = 1012

 

8x + 3x = 1012

 

11x = 1012

 

x = 92

 

Walmart sold 92 hot water bottles and 2 * 32 = 184 thermometers in Dec.