Malala is following this recipe for bread rolls. She uses 400 ml of water.
How much of each of the other ingredients does she use?

Recipe:Makes 15 bread rolls
520 g flour
12 g salt
10 g yeast
30 ml oil
500 ml water

g flour
g salt
g yeast
ml oil

step-by-step explanation: given equation a = h(b 1+b 2)

also we are given values of a, h and b 1 as :

a = 16, h = 4, and b 1 = 3.

in order to solve it for b 2, we need to plug the given values of   a, h and b 1 .

therefore, plugging values of   a, h and b 1   in given equation, we get

16 = 4( 3 + b 2)

first dividing both sides by 4, we get

4 = 3 + b 2

subtracting 3 from both sides, we get

4 -3 = 3 -3 + b 2

1 = b 2.