Question

If ‘-’ means ‘+’, ‘+’ means ‘-’, ‘*’ means ‘÷’ and ‘÷’ means ‘*’ then which of the following will be the correct equation? 
a. 10 + 5 - 14 ÷ 10 * 15 = 158
b. 30 + 5 + 14 - 10 * 15 = 122
c. 30 - 5 + 14 ÷ 10 * 15 = 162
d. 30 * 5 - 4 ÷ 10 + 15 = 31
e. None of these

GuD NiGhT❣️​

Answer 1

Given :- ‘-’ means ‘+’, ‘+’ means ‘-’, ‘*’ means ‘÷’ and ‘÷’ means ‘*’

To find :- which of the following will be the correct equation ? 

a. 10 + 5 - 14 ÷ 10 * 15 = 158

b. 30 + 5 + 14 - 10 * 15 = 122

c. 30 - 5 + 14 ÷ 10 * 15 = 162

d. 30 * 5 - 4 ÷ 10 + 15 = 31

e. None of these

Answer :-

checking all options we get,

a) 10 + 5 - 14 ÷ 10 * 15 = 158

→ 10 - 5 + 14 * 10 ÷ 15 = 158

→ 10 - 5 + 14 * (10/15) = 158

→ 5 + (28/3) = 158

→ (43/3) ≠ 158

b) 30 + 5 + 14 - 10 * 15 = 122

→ 30 - 5 - 14 + 10 ÷ 15 = 122

→ 30 - 19 + (10/15) = 122

→ 11 + (10/15) = 122

→ (175/11) ≠ 122 .

c) 30 - 5 + 14 ÷ 10 * 15 = 162

→ 30 + 5 - 14 * 10 ÷ 15 = 162

→ 35 - 14 * (10/15) = 162

→ 35 - (28/3) = 162

→ (77/3) ≠ 162

d) 30 * 5 - 4 ÷ 10 + 15 = 31

→ 30 ÷ 5 + 4 * 10 - 15 = 31

→ 6 + 40 - 15 = 31

→ 46 - 15 = 31

→ 31 = 31 .

therefore, option (d) is correct answer .

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