Question

Every day Brian put $0.30 in his piggy bank, and his father put in 2 times that amount. At the end of 21 days, how much money had Brian and his father put in the piggy bank?

$18.90
$18.90

$6.30
$6.30

$12.60
$12.60

$189.00
$189.00

Answer 1

Given :-

Every day Brian put $0.30 in his piggy bank, and his father put in 2 times that amount. At the end of 21 days,

To Find :-

How much money had Brian and his father put in the piggy bank?

Solution :-

At first

Money invested by Brian = 21(0.30) = 6.30

Now

Since his father put times more

So

Money invested by father = 0.30 × 2 × 21

= 0.6 × 21

= 12.6

Total money put = 12.6 + 6.3

Total money put = 18.9

Option A is correct

Answer 2

Answer:

At first

Money invested by Brian = 21(0.30) = 6.30

Now

Since his father put times more

So

Money invested by father = 0.30 × 2 × 21

= 0.6 × 21

= 12.6

Total money put = 12.6 + 6.3

Total money put = 18.9

Option A is correct