Qstnid -B-4- 12 Pipes, All Of The Same Size, Fill A Tank In 42 Minutes. How Long Will It Take To Fill The Same Tank, If 21 Pipes Of The Same Size Are Used? - 10: Direct And Inverse Variations Class 8 Maths - Icse-viii-mathematics

Home Learn Fast select Course

Show Unit/Chapter Change Unit Change Subject Last Menu

ICSE-VIII-Mathematics

10: Direct and Inverse Variations Class 8 Maths

with Solutions - page 2

Qstn# B-4 Prvs-Qstn Next-Qstn

#4
12 pipes, all of the same size, fill a tank in 42 minutes. How long will it take to fill the same tank, if 21 pipes of the same size are used?
Ans : Pipes : Time :: Pipes : Time
12 : 2x :: 21 : 42
∴ By inverse proportional
12 × 42 = 21 × x
⇒ x = (12 × 42)/21
= 24 minutes