Statements: All stairs are marbles.
All marbles are tiles.
Some tiles are irons.
Conclusions: I. Some tiles are stairs.
II. Some marbles cannot be stairs.
All stairs are marbles(A) + All marbles are tiles (A) ⇒All stairs are tiles(A) ⇒Conversion ⇒Some tiles are stairs. Hence, conclusion I follows. All stairs are marbles(A) ⇒Conversion ⇒Some marbles are stairs(I). Hence, conclusion II does not follow.
9999² + 1111² =?
641.5 + 72 × 8 = ? × 4
72 + 122 - 25% of 600 = ?
∛157464 =?
6 0 - 20 [8 + 12 {8-8 (20-12)+20}-40] ÷ 16 =?
(49 x ?) / 3.5 + 389 = 627
2850 ÷ 2.5 - ? × 42 = 300
135.37 – 50.24 + 629.09 – 199.50 = ? – 214.68 + 42.65
1885 ÷ 64.98 + 7.29 + ? = 69.09
? ÷ 8 = 2048 ÷ 64