The price of commodity X increases by 40 paisa every year, while the price of commodity Y increases by 15 paisa every year. If in 2023, the price of commodity Х was Tk 4.20 and that of Y was Tk 6.30, in which year commodity X will cost 40 paisa more than the commodity Y?

Question: The price of commodity X increases by 40 paisa every year, while the price of commodity Y increases by 15 paisa every year. If in 2023, the price of commodity Х was Tk 4.20 and that of Y was Tk 6.30, in which year commodity X will cost 40 paisa more than the commodity Y?

Solution:
দেওয়া আছে, 2023 সালে:
X = 420 পয়সা, Y = 630 পয়সা
ধরি, n বছর পর শর্তটি পূরণ হবে।

প্রশ্নমতে,
(420 + 40n) - (630 + 15n) = 40
⇒ 25n - 210 = 40
⇒ 25n = 250
⇒ n = 10

∴ বছরটি হবে = 2023 + 10 = 2033