Mrs Lim buys 24 stamps at the post office, a mix of 50-cent stamps and 80-cent stamps. In total she pays $15.60. How many 80-cent stamps did she buy?
Opening the drawing…
MathBrush is being tested with a few parent groups, and every solution on the site is open to them. If you were given a code, it goes in once and this device remembers it. 65 worked examples are free to everyone without one.