Select the correct combination of mathematical signs that can sequentially replace the * signs and make the equation correct.
50 * 7 * 5 * 45 * 3
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → =, ×, +, ÷
Put the signs of an option in place of the * signs in order, and work out each side of ‘=’ by BODMAS. The option is right only when the two sides are equal.
With =, ×, +, ÷ the equation reads 50 = 7 × 5 + 45 ÷ 3
\(7\times5=35\)
\(45\div3=15\)
Right side \(=35+15=50\), equal to the left side 50
Why the other options are incorrect
Option (1) ×, +, –, = — Incorrect. 50 × 7 + 5 – 45 = 3 gives \(350+5-45=\) 310 on the left, not 3.
Option (3) +, ÷, –, = — Incorrect. 50 + 7 ÷ 5 – 45 = 3 gives \(50+1.4-45=\) 6.4 on the left, not 3.
Option (4) ×, +, =, ÷ — Incorrect. 50 × 7 + 5 = 45 ÷ 3 gives 355 on the left and 15 on the right.