Bela has ₹100 for pocket money. She spends 5 every day. What amount will be left on the 15th day? How many days will it take for the entire amount to be spent?
Polynomials
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Question

Bela has ₹100 for pocket money. She spends 5 every day. What amount will be left on the 15th day? How many days will it take for the entire amount to be spent?

KnowledgeBoat · Accepted Answer

Let n be the number of days and A be the amount left (in ₹) after n days. Since Bela starts with ₹100 and spends ₹5 every day, the amount left after n days is: A = 100 − 5n Amount left on the 15th day: Substituting n = 15 in A = 100 − 5n: A = 100 − 5 × 15 ⇒ A = 100 − 75 ⇒ A = 25 So, ₹25 will be left on the 15th day. Number of days for the entire amount to be spent: The entire amount is spent when A = 0. Substituting A = 0 in A = 100 − 5n: 100 − 5n = 0 ⇒ 5n = 100 ⇒ n = ⇒ n = 20 So, it will take 20 days to spend the entire amount. Hence, ₹25 will be left on the 15th day, and it will take 20 days for the entire amount to be spent.

Mathematics

Bela has ₹100 for pocket money. She spends 5 every day. What amount will be left on the 15th day? How many days will it take for the entire amount to be spent?

Polynomials

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