यदि (C(t)=130-5t) और (D(t)=70+3t), तो किस (t) पर (C(t)) (D(t)) से (12) कम होगा?
If (C(t)=130-5t) and (D(t)=70+3t), at what (t) will (C(t)) be (12) less than (D(t))?
Explanation opens after your attempt
B. \(t=9\)
Simple Explanation
“\(C(t)\), \(D(t)\) से 12 कम” का अर्थ है \(C(t)=D(t)-12\)। अतः \(130-5t=70+3t-12\)। सरल करने पर \(72=8t\), इसलिए \(t=9\)। \(t=8\) निकट विकल्प है, लेकिन उस पर दोनों मानों का अंतर 12 नहीं होता। परीक्षा टिप: “से कम” वाले प्रश्न में बड़े व्यंजक में से दी गई संख्या घटाकर समीकरण बनाइए। / “\(C(t)\) is 12 less than \(D(t)\)” means \(C(t)=D(t)-12\). Thus, \(130-5t=70+3t-12\). Simplifying gives \(72=8t\), so \(t=9\). Option \(t=8\) is close, but the difference between the two values is not 12 there. Exam tip: For “less than” comparisons, subtract the stated amount from the larger expression before forming the equation.
Login to save your score, XP, coins and progress.
