 
 <prompt> Karen's class fund contains only $10 and $20 bills,  which amount to $120. The number of $10 bills is twice as many $20 bills. How many $20 bills do they have in their fund? 

Karen's din kula fund na dauke da kudin $10 da kuma $20, wanda ya samu zuwa $120. Adadin kudin $10 shine dubu biyu a matsayin kudin $20. Me kudin $20 suna da su a cikin kudin su? <response>: ```Idan n shine lambar kudin $20 to nawa ne, to 2n zai kasancewa lambar kudin $10.
Saboda haka matsayinmu zai kasancewa $10(2n) + $20n = $120.
Tare da bincike na farko, matsayinmu zai kasancewa 40n = 120.
Duk da haka, kima na n wanda ya nuna lambar kudin $20 shine 120/40 = 3.

Sami kira: 3.``` 