If you add 1/3 of a number to itself you get 1348 what is the number

Liz had 140 pens and inna had 100 pens. after inna gave liz some pens, liz had 3 times as many pens as inna. how many pens did inna give liz?

Lucy spent $165 in december using a new credit card. in january, she began paying between $15 and $25 each month towards her account balance.

24m^2n+30mn^2+18mn, a sweet challenge!