Question

A box contains red, blue and black paper clips in a ratio 2:5:7. If the difference
between the number of black and red paper clips is 20, how many paper clips are
there in a box altogether?​

Answer 1

Answer:

No of clips in the box = 140

Step-by-step explanation:

no of red clips = 2x

no of blue clips = 5x

no of black clips = 7x

The difference between the number of black and red paper clips is 20,

7x-5x = 20

2x = 20

x = 10

no of clips in the box,

2x+5x+7x = 20+50+70 = 140