Question

0.4(0.5+7) =1.2-0.2a​

Answer 1

Answer:

If 0.4(0.5+7) =1.2-0.2a​ then a = 43.

Step-by-step explanation:

a(b+c) = ab +ac

0.4(0.5 + 7) = 1.2 - 0.2a​

0.4(0.5) + 0.4 (7) = 1.2 - 0.2a

2.0 + 1.4 = 12 - 0.2 a

3.4 = 12 - 0.2 a

3.4 - 12 = -0.2a

- 8.6 = -0.2a

a = 8.6 ÷ 0.2

a = 43

Answer 2

In context to question asked,

We have to determine the value of a

As per question,

We have,

$0.4(0.5+7) =1.2-0.2a$

So, for determining the value of a, we will first solve the LHS part,

So, we will get,

$0.4(0.5+7) =1.2-0.2a\\0.4\times 7.5 = 1.2-0.2a\\=>30 = 1.2-0.2a$

So, for further solving we  will separate the like terms on one side.

Thus we will shift 1.2 from RHS to LHS,

Thus we will get,

$30=1.2-0.2a\\=>0.2a = 1.2-30\\=>0.2a = 28.8\\=>a = -\frac{28.8}{0.2}\\=>a = 144$

Hence, value of a will be 144