mental ability

X ∪ Y means divide X by Y
X ↑ Y means multiple X by Y
X # Y means subtract Y from X
X ∩ Y means add Y to X
Ex 9. One-fifth of one-tenth of two-third of a number X is given by
(A) X ↑ (1∪ 5) ↑ (1∪10) ↑ (2 ∪ 3) (B) (X 1 ↑ 5)(1 ↑ 10)(2 ↑ 3)
(C) (X 1 ↑ 5)(2 ↑ 10)(2 ↑ 3) (D) can’t be determind