Question

Ratios/proportions problem?

Answer 1

$10.5, $15.75, $0.7 respectively

Explanation:

Given that lb is the unit of pounds.

3 lb = 31 lb
4.5 lb = (9/2)1 lb
0.2 lb = (1/5)*1 lb

Therefore answers are as follows:
(a) required amount
= `3*($3.50)`
= `$10.5`

(b) required amount
= `9/2*($3.50)`
= `$15.75`

(c) required amount
= `1/5*($3.50)`
= `$0.7`

Another solving method: let $x be the value of n lb candies.
`x/n = 3.50/1`

`(1)x = 3.50n`

`x=3.50n`,
which gives the above calculations.

Answer 2

3lbs will cost = $10.50#

4.5lbs will cost `= $15.75`

`0.2 lb will cost`= $0.70#

Explanation:

If 1 lb costs $3.50, 2 lbs will cost twice the amount of $3.50 or `2*3.50=$7`

Hence 3lbs will cost `3*3.50 = $10.50`

4.5lbs will cost `=4.5 * 3.50 = $15.75`

`0.2 lb will cost`0.2 * 3.50 = $0.70#