Answer:
I believe is b. and d.
Step-by-step explanation:
2/5 * x = 4
x = 4 : 2/5
1 bag is 2/5 kg.
The customer wants to buy 4 kg. So you need to multiply the single bag for a number that will give you 4 in total.
Here is an example with whole numbers, 8nstead of fraction. if the bag was 2 kg, and you want a total of 4kg. You need to multiply that 2 by a number x to get to your total 4. so you will have 2 * x = 4
That’s why you have 2/5 * x = 4
to isolate x, you need to devide both side by 2/5.
2/5 * x = 4
: 2/5 : 2/5 (Divide both sides by 2/5)
x = 4 : 2/5
