Question 4 (a) - Figure it out - Page 185 to 189 - Chapter 7 Class 7 - Finding the Unknown (Ganita Prakash II)

Transcript

Question 4 (a) Here are machines that take an input, perform an operation on it and send out the result as an output. Find the inputs in the following cases:First equation We can go in reverse Final answer is 75 It is –5, so we add 5. Thus, 75 + 5 = 80 Number if multiplied by 4, so we divide. Thus, 𝟖𝟎/𝟒 = 20 We add 3, so we subtract 3. Thus, 20 – 3 = 17 Thus, our input is 17 Second equation We can go in reverse Final answer is 43 It is –5, so we add 5. Thus, 43 + 5 = 48 Number if multiplied by 4, so we divide. Thus, 𝟒𝟖/𝟒 = 12 We add 3, so we subtract 3. Thus, 12 – 3 = 9 Thus, our input is 9