 
<translate> Ha na-emefu $8 n'otu n'otu na cheeseburgers na milkshakes n'ihi na 3 + 5 = 8. Ha mefuru $16 na ngụkọta maka ihe ndị a n'ihi na 2 x 8 = 16. Ha mefuru $24 maka nri ha n'ihi na 16 + 8 = 24. Ha nwere $30 ka ha bido n'ihi na 24 /.8 = 30. Nwa nwanne nna ya nwere $10 n'ihi na 30 - 20 = 10. N'ihi ya, azịza ya bụ 10. <eng> They spent $8 each on cheeseburgers and milkshakes because 3 + 5 = 8. They spent $16 on these items in total because 2 x 8 = 16. They spent $24 on their meal because 16 + 8 = 24. They had $30 to start because 24 / .8 = 30. His cousin had $10 because 30 - 20 = 10.
Therefore, the answer is 10. 