Urea was first organic compound to be prepared in the laboratory, which was prepared by Friedrich Wohler, a German chemist in the year 1828.
464 + 181 +? = (154 × 25) - (15) 2
[(40)2 ÷ 32 × 4] ÷ 50 = ?
182 – 517 ÷ 11 - √361 = ?
45% of 360 - 160 + ? = √324
(292 – 141) ÷ 5 + (40 ÷ 2) + 23 = ?
15% of 5000 - √900 = ? + 10% of 1800
242 + 18 × 8 – ? = 356
212 + 14 × 23 – 28 × 15 = ?
325934.78 + 78545.30 + 92.25 =?
√ 729 × 5 – 220 % of 15 + ? = 120% of 160
