Sixty-five percent of a number is 21 less than; four-fifth of that number. What is the number?

A 140

B 150

C 160

D None of these

Solution

Correct Answer: Option A

ধরি, সংখ্যাটি X

প্রশ্ন অনুযায়ী:
65% of x = (4/5)x - 21

মানে:
0.65x = (4/5)x - 21

এখন দুই পাশে x-সম্পর্কিত পদ একত্র করি:
(4/5)x - 0.65x = 21

(4/5) = 0.80, তাই:
0.80x - 0.65x = 21
0.15x = 21
x = 21 ÷ 0.15
x = 140

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