○+○=□+□+□=△+△+△+△

△+○+□=65

△=( 15) ○=(30) □=(20)

Solution: Because ○+○ = □+□ = △+△

So ○ = △ +△

□=△×4/3

△+○+□=65

△+△+△+△×4/3=65

△× 13/3=65

So delta =15

○=30

□=20