Chase and Rider can ride their bikes thrice a day for 5 days; but on two other days, they ride twice the times they do on usual days. How many times do they ride their bikes a week?
Each person rides his bike 3 x 5 = 
<gadget id="calculator">3*5</gadget>
<output>15</output>
15 times for 5 days.
Together, they ride 15+15 = 
<gadget id="calculator">15+15</gadget>
<output>30</output>
30 times for five days.
Each person rides his bike 3 x 2 = 
<gadget id="calculator">3*2</gadget>
<output>6</output>
6 times for every day of the other two days.
This means each person rides 6*2 = 
<gadget id="calculator">6*2</gadget>
<output>12</output>
12 times on each day of the other two days.
The total for the other two days is 12+12 = 
<gadget id="calculator">12+12</gadget>
<output>24</output>
24.
For the whole week the together ride 24+30 = 
<gadget id="calculator">24+30</gadget>
<output>54</output>
54 times.

<result>54</result>