दो संख्याएँ A और B दी गई हैं। यदि A बढ़ता है, तो B उसी अनुपात में घटता है (व्युत्क्रमानुपाती)। यदि A = 300 होने पर B = 400 है, तो A = 400 होने पर B का मान ज्ञात कीजिए।

In a camp, food supplies are available for 21 students for 30 days. If the number of students in the camp is increased to 70, in how many days will the same food supplies last?

Three individuals, X, Y, and Z, are co-sureties for a business loan of ₹1,20,000 granted to a firm. They have agreed to different maximum liability limits: X up to ₹20,000, Y up to ₹40,000, and Z up to ₹80,000. The firm defaults on the entire amount of ₹1,20,000. Calculate the amount each co-surety is liable to pay according to Section 147 of the Indian Contract Act.