A)estimate 49% of 162. b) use mental math to calculate 49% of 162. plz i need to know fast

(a)

Given expression: 49% of 162

we can write 49% as

then;

Therefore, the estimate of the given expression is, 79.38.

(b)

Using mental math to calculate 49% of 162.

Mental math is used as a way to calculate an estimate quickly.

We can write 49% = 50% -1%

(50%-1%) of 162 = 50% of 162 -1% of 162

so,

50% of 162 =

and

1% of 162 =

Now, subtract these we get;

81 - 1.62 = 79.38

Therefore, by using mental math 49% of 162 is, 79.38

597

step-by-step explanation:

x/3-10=8

x/3=18

x=48