Mathematical Operations and Problem-Solving Exercises
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Math exercises, problem-solving, algebra, geometry, arithmetic operations, mathematical concepts
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This document provides solutions to various mathematical exercises, covering topics such as algebra, geometry, and arithmetic operations. It is a useful resource for students looking to improve their problem-solving skills and understand mathematical concepts.
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[...] Exercise 2 : Question 1 : 3 x 7 = 21; 21 + 3 x 3 = 21 + 9 = 30 7 x 7 = 49; 49 + 3 x 7 = 49 + 21 = 70 21 x 7 = 147; 147 + 3 x 21 = 147 + 63 = 210 Question 2 : Let's take x as the starting number: X x 7 = 7X 7X + 3xX = 7X + 3X = 10X So, it's enough to multiply the starting number by 10 to get the final result. Question 3 : 10X = 50 X = 50/10 X = 5 To get 50 the initial number chosen was 5. [...]
[...] To find out the price paid by each client, it is enough to multiply the quantities of products purchased by their unit price and add them up. Question 2 : First client : 3 x 0.65 + 2 x 0.80 + 3 x 0.75 = 1.95 + 1.60 + 2.25 = 5.80 Second client : 2 x 0.65 + 2 x 0.80 + 1 x 0.75 = 1.30 + 1.60 + 0.75 = 3.65 Third client : 4 x 0.65 + 4 x 0.80 + 4 x 0.75 = 2.60 + 3.20 + 3.00 = 8.80 The first client will pay 5.80 euros, the second 3.65 euros and the third 8.80 euros. [...]
