Question

A number decreased by 30% gives 84. The number is
i)90
ii)110
iii)120
iv)135
ᴡɪᴛʜ ғᴏʀᴍᴜʟᴀᴇ​

Answer 1

let the certain number be x

Step-by-step explanation:

=> x - 30 % of x = 84

=> x - 0.3 x = 84

=> x = 84/0.7 = 120

NOW,

VERIFICATION:‐

SUBSTITUTE THE VALUE OF x IN QUESTION =>

=> 120 ‐ 30% of 120 = 84

=> 120 ‐ 0.3 x 120 = 84

=>120 -36=84

=> 84 = 84

L.H.S = R.H.S

HENCE,

THE NUMBER IS 120