Fix the symbols +, -, x, ÷ appropriately in the box to fit the equation given here.
5 □ 1 □ 3 □ 5 = 20

Correct option is D

equation:
The equation is: 5 □ 1 □ 3 □ 5=20
Option Analysis:
(a) -, x, x
· Substitute: 5−1×3×5
· Calculation:
· 1×3=3
· 3×5=15
· 5−15=−10 (does not equal 20)
This option does not work.
(b) -, +, -
· Substitute: 5−1+3−5
· Calculation:
· 5−1=4
· 4+3=7
· 7−5=2 (does not equal 20)
This option does not work.
(c) x, x, -
· Substitute: 5×1×3−5
· Calculation:
· 5×1=5
· 5×3=15
· 15−5=10 (does not equal 20)
This option does not work.
(d) ÷, +, x
· Substitute: 5÷1+3×5
· Calculation:
· 5÷1=5
· 3×5=15
· 5+15=20 (equals 20)
This option works.
Answer:
The correct answer is (d) ÷, +, x.
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