A basket of apples sold 15, and then sold 6 kg. At this time, the weight sold is just the remaining 12. How many kg of the original basket of apples?

A basket of apples sold 15, and then sold 6 kg. At this time, the weight sold is just the remaining 12. How many kg of the original basket of apples?

A: this basket of apples used to be 45 kg

The fruit shop brought in 60 grams of fruit in two baskets of a and B. If three seventh of a basket is put into B basket, the weight ratio of a and B baskets of apples is 2:3
How many kilos of apples did a and B have
Equation or formula

A basket original 60 △ 2 + 3 x2 △ 1-3 / 7 = 42 kg
Basket B original 60-42 = 18 kg

There are 100 balls in box a and 80 balls in box B. how many balls are taken out of box a and put into Box B? The ratio of the number of balls in box a and Box B is 4:5?

Suppose how many balls are taken out of box a and put into Box B, and the ratio of the number of balls in box a and Box B is 4:5
According to the meaning of the title:
（100-x）：（80+x）=4：5
5*（100-x）=4*（80+x）
500-5x=320+4x
9x=180
x=20
A: take out 20 balls from box a and put them into box B. the ratio of the number of balls in box a and Box B is 4:5