A number when divided by 43 gives 12 as quotient and 24 as remainder. The number is

1. 547

2. 545

3. 543

4. 540

Given:

Divisor = 43

Quotient = 12

Remainder = 24

By formula,

Dividend = Divisor x Quotient + Remainder

Substitute the values into the formula:

Dividend = 43 x 12 + 24

= 516 + 24

= 540.

Hence, option 4 is the correct option.