EM-1889

Forming equations from word problems

E Math · Secondary 4 · Hard · Forming equations from word problems

The exchange rate is USD 1 = SGD

y

. In 2025, the rate was such that USD 1 would exchange for SGD 0.025 less than in 2026. The difference in USD received when exchanging SGD 12 000 in 2026 and SGD 12 000 in 2025 is 150 USD. Which equation represents this information?

$\dfrac{12000}{y} - \dfrac{12000}{y-0.025} = 150$
$\dfrac{12000}{y-0.025} - \dfrac{12000}{y} = 150$
$12000y - 12000(y-0.025) = 150$
$\dfrac{12000}{y} + \dfrac{12000}{y-0.025} = 150$

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