Question

(d) Decrease 216 by 37%
2. (a) 20% of a number is 17. Find the number.
(b) 175% of a number is 49. Find the number.
(C) The result of a number, when increased by
15%, is 161. Find the number.
(d) The result of a number, when decreased by
20%, is 192. Find the number.​

Answer 1

(d) 216 - (216 × 37/100) = 216 - 79.92 = 136.08

2.(a) 17 × 20/100 = 3.4

(b) 49 × 175/100 = 85.75

(c) 161 = 115%

? = 100%

cross multiplication,

161 × 100% = 115% × ?

161 × 100% / 115% = ?

140 = ?

(d) 192 = 80%

? = 100%

cross multiplication,

192 × 100% = 80% × ?

192 × 100% / 80% = ?

? = 240