有請各位幫幫手下面條題目:
There are 90 pieces of watermelon and 90 pieces of pineapple. They are put onto plates so that each has 10 pieces of watermelon and 6 pieces of pineapple.Which of the following expressions can be used to calculate the number of remaining pieces of pineapple?
A. 90/6x10-90
B. 90/10 x 6-90
C. 90-90/10 x 6
D. 90+90-90/10 x 6
答案係C,但係我都唔係好明點解,有冇人可以幫手解釋詳情?