Which one of the following four interchanges in signs and numbers would make the given equation correct?
9 ÷ 15 x 12 = 20
Answer & explanation
Correct answer: option 3
- Considering each case separately-
a) Making the interchanges given in 1, we get 9 x 12 ÷ 15 = 20; 7.2 = 20, which is false.
b) Making the interchanges given in 2, we get 15 x 9 ÷ 12 = 20; 11.25 = 20, which is false.
c) Making the interchanges given in 3, we get 12 x 15 ÷ 9 = 20; 20 = 20, which is true.