If I take 1 chocolate and if I multiply with 24 and I divide by 56 plus 70 equals to how much

Q. If plus means divided by, multiplied by means minus, divided by means multiplied by and minus means plus, then $18+3÷4-8\times 12=?$

Q. I get 10 chocolates for ₹ 100 and my friend gets 15 for ₹ 120 from another store. If I buy my chocolates from the same store as my friend, how much less would I have to pay for each chocolate that I buy?

Q. A chocolate is equally divided between Ram and Harsha. If Harsha gave half of his chocolate to his sister, how much chocolate did she get?

Q. I think of a number (say $x$), multiply it by $4$ and $5$, divide the result by $2$, take away the number I first thought of and I get the answer as $18$. The number I first thought of is