Mike bought 5 face masks while Johnny bought 2 more than thrice as many as Mike. How many face masks did Johnny buy?
Thrice as many as Mike's face masks is 5 x 3 = 
<gadget id="calculator">5*3</gadget>
<output>15</output>
15.
So, Johnny bought 15 + 2 = 
<gadget id="calculator">15+2</gadget>
<output>17</output>
17 face masks.

<result>17</result>