On a hot summer day, Sunny bought 18 ice creams for her team members. Some were $7 each, and the others were $10 each. If she paid $165 in total, how many $7 ice creams did she buy?

Answer 1

number of cheaper ice creams --- x
number of more expensive ones ---- 18-x

solve for x

7x + 10(18-x) = 165

( I know things are getting expensive, but $10 ice creams ???)