Hi, Please correct the tenses. I think the usual approach is to use present tenses for situations like this:
Joe goes (not, 'went') in to buy an ice cream and buys (not, 'bought') one that costs one dollar and fifty cents. He pays (not, 'paid') two dollars. How much is his change?
But setting aside that issue, would you say these are correct?
1. Jenny had six apples. She was hungry and eats (has to be 'ate'?) two. How many are left?
2. Joe went into a store and bought a candy that costs one dollar and a chocolate bar that costs one dollar and ten cents. How much does (did??) he have to pay to the cashier?
3. Joe went into a store and bought a candy that costs one dollar and a chocolate bar that costs one dollar and ten cents. He handed a five-dollar bill. How much does (did??) he have to get back in change?
4. Joe had two candies. Since it is/was? a holiday, he eats/ate all of them. How many does/did? he have (now)?