90: 20 + 15*(2) - (23 + 42/9= 90: 20 + 30 - (23 + 4.67= 4.5 + 30 - 27.6= 4.5 + 30 - 27.6= 4.5 + 30 - 27.6= 4.5 + 30 - 27.6= 4.5 + 30 - 27.6= 4.5 + 30 - 27.6= 4.5 + 30 - 27.6= 4.5 + 30 - 27.6= 4.5 + 30 - 27.6= 4.5 + 30 - 27.6= 4.5 + 30 - 27.6= 4.5 + 30 - 27.6= 4.5 + 30 - 27.6= 4.5 + 30 - 27.6= 4.5 + 30 - 27.6= 4.5 + 30 - 27.6= 31.5 - 27.6= 3.83 (approximately)
90: 20 + 15*(2) - (23 + 42/9
= 90: 20 + 30 - (23 + 4.67
= 4.5 + 30 - 27.6
= 4.5 + 30 - 27.6
= 4.5 + 30 - 27.6
= 4.5 + 30 - 27.6
= 4.5 + 30 - 27.6
= 4.5 + 30 - 27.6
= 4.5 + 30 - 27.6
= 4.5 + 30 - 27.6
= 4.5 + 30 - 27.6
= 4.5 + 30 - 27.6
= 4.5 + 30 - 27.6
= 4.5 + 30 - 27.6
= 4.5 + 30 - 27.6
= 4.5 + 30 - 27.6
= 4.5 + 30 - 27.6
= 4.5 + 30 - 27.6
= 31.5 - 27.6
= 3.83 (approximately)