Question

At the Science Museum, there is an exhibition with 120 displays about energy. 35% of the displays are about electricity. 2/5 are about using renewable energy. The remainder are about the use of gas.

Answer 1

there is no question here, so I'll break down a few things. Electricity- 35% (.35) of the displays is 42. Renewable energy- 2/5 or .4 of the displays is 48 displays. The rest of the displays (100-35-40, or 25%) on gas are 30.

Answer 2

Answer:

There were 30 displays about the uses of gas.              

Step-by-step explanation:

We are given the following information:

Total number of displays = 120

Displays about electricity = 35%

$35\%\times 120 = \displaystyle\frac{35}{100}\times 120 = 42$

Displays about renewable energy =

$\displaystyle\frac{2}{5}\times \text{Total number of displays} = \frac{2}{5}\times 120 = 48$

Display about uses of gas =

$\text{Total number of displays - Displays about electricity - Displays about renewable energy}\\= 120 - 42 -48\\=30$

There were 30 displays about the uses of gas.