勁急呀 7題F1數學問題(英文) 20點

Question 5
percentage decrease = decrease/ original x 100
% = 6/80 x 100
=7.5%

Question 6
percentage increase = increase/ original x 100
% = (32-8)/8 x 100
=300%

Question 7
percentage decrease = decrease/ original x 100
% = (8-7.88)/8 x 100
=1.5%

Question 8
percentage increase = increase/ original x 100
% = 6/(24-6) x 100
=50%

Question 9
12 x 1.25 = 15 batteries in a pack

Question 10
320 x (1-0.375) = 200 students

Question 11
Let x be the number of classmates who joined last year
105% of x = 21
1.05x=21
x=21/1.05
x=20 students

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