Select the correct combination of mathematical signs to sequentially replace the * signs and to balance the given equation.
20 4 10 5 15 = 93
- A+ ÷ - ×
- B÷ × + -
- C× ÷ + -
- D× - ÷ +
Solution & Step-by-step Explanation
Let's plug in the sign options sequentially into the expression and evaluate using BODMAS rules:
Checking Option C (×, ÷, +, -):
20×4÷10+5−15
According to BODMAS, execute division first:
4÷10=
10
4
=0.4
Now multiplication:
20×0.4=8
Now addition and subtraction:
8+5−15=13−15=−2
=93
Checking Option D (×, -, ÷, +):
20×4−10÷5+15
Execute division first:
10÷5=2
Now multiplication:
20×4=80
Substitute back:
80−2+15=78+15=93
Since 93=93, Option D balances the equation perfectly.
Checking Option C (×, ÷, +, -):
20×4÷10+5−15
According to BODMAS, execute division first:
4÷10=
10
4
=0.4
Now multiplication:
20×0.4=8
Now addition and subtraction:
8+5−15=13−15=−2
=93
Checking Option D (×, -, ÷, +):
20×4−10÷5+15
Execute division first:
10÷5=2
Now multiplication:
20×4=80
Substitute back:
80−2+15=78+15=93
Since 93=93, Option D balances the equation perfectly.