The unit price of exercise books is 0.6 yuan. The relationship between the quantity x (yuan) of exercise books and the total price y (yuan) (about function)

The unit price of exercise books is 0.6 yuan. The relationship between the quantity x (yuan) of exercise books and the total price y (yuan) (about function)


y=0.6x



In June, class 1 of Grade 7 spent 240 yuan to buy two kinds of pure water, including 8 yuan per barrel of pure water of type A, 2 yuan cheaper than pure water of type B, and 75% of pure water of type B. how many barrels of pure water of type A and type B?


We bought x barrels of type a purified water and X △ 75% barrels of type B purified water
8x+(8-2)(x÷ 75%)=240
8x+6*4/3x=240
8x+8x=240
16x=240
x=15
15 △ 75% = 20 barrels
A: I bought 15 barrels of type a purified water and 20 barrels of type B purified water