Question 42Asked in CTET August 2023 Paper 2 Maths & Science, 20 Aug 2023

The cost of painting the surface of a solid cuboid of dimensions 40 cm × 36 cm × x cm at ₹20 per 100 cm² is ₹1,032. What is the value of x?विमाओं 40 cm × 36 cm × x cm वाले एक ठोस घनाभ के पृष्ठ को ₹20 प्रति 100 cm² की दर से पेंट कराने की लागत ₹1,032 है । x का मान क्या है ?

विमाओं 40 cm × 36 cm × x cm वाले एक ठोस घनाभ के पृष्ठ को ₹20 प्रति 100 cm² की दर से पेंट कराने की लागत ₹1,032 है । x का मान क्या है ?
  1. A2020
  2. B1515
  3. C2424
  4. D1212
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Correct answer: (B) 1515

Explanation

Surface area = 1032 × 100/20 = 5160 cm². 2(40×36 + 36x + 40x) = 2880 + 152x = 5160, so 152x = 2280 and x = 15.पृष्ठीय क्षेत्रफल = 1032 × 100/20 = 5160 cm²। 2(40×36 + 36x + 40x) = 2880 + 152x = 5160, इसलिए 152x = 2280 और x = 15।

From CTET August 2023 Paper 2 Maths & Science, 20 Aug 2023 — Previous Year Paper

This is question 42 of CTET August 2023 Paper 2 Maths & Science, 20 Aug 2023 — Previous Year Paper. See all questions of this paper with answers, or attempt the paper as a timed online test to get your score and all-India rank.