1, one-third of A is equal to two-fifths of B, A is (6/5) of B, and B is (5/6) of A. A number is the sum of A and B (6/ 1 1), and B number is the sum of two numbers (5//kloc-0)

2. The books on the first floor of the bookshelf are three-tenths of those on the second and third floors, and the books on the first floor are books on the third floor (3/ 13). In March and April, the actual coal consumption was reduced by one twelfth compared with the original plan, and the actual coal consumption was planned (1112).

(original planned coal consumption) ×112 = (actual coal consumption saved than planned)

(original planned coal consumption) × (1-112) = (actual coal consumption)

Second,

According to the meaning of the question,

(male-1) × 2 = female, that is, 2 male -2 = female.

Female-1 = male, then

2 male -2- 1 = male, get: male = 3 people.

Female = 2 male -2 = 2× 3-2 = 4 people.

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