Answer:

a. 59

b. 75

Step-by-step explanation:

a. [5+(20÷2×5)] + 4

[5+(50)] + 4

55 + 4

59

b. [(10÷2) + [(10+4) ×5]

[(5) + [(14) ×5]

5 + 70

75

Verified answer

Answer:

a. 59

b. 75

Step-by-step explanation:

Use the PMDAS technique

Parenthesis

Multiplication

Division

Addition

Subtraction

Do the numbers enclosed in a parenthesis

first. e.g.

(20 - 15) x 5

Here we don't multiply first

we subtract 15 first from 20 before multiplying by 5

If division came first e.g.

50 ÷ 10 x 5

do the division first.

If multiplication came first, e.g.

15 x 2 ÷ 6

do the multiplication first.

In other words

Multiplication or division from left to right of the equation.

Same goes with addition and subtraction

Remember,

multiplication and division first before addition and subtraction

here in question a,

the division sign came first before the multiplication sign.

Therefore,

a.[5+(20÷2×5)] + 4

= [5+(10 x 5)]+4

= [5+50]+4

= 55+4

=59

Here in question b,

the division sign came first before the multiplication sign again.

Therefore,

(10÷2) + [(10+4) ×5]

= 5 + [(10+4) x 5]

= 5 + [14 x 5]

= 5 + 70

=75

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