Rob has a bag with white, black and blue counters. There are twice as many blue counters than there are white. A qaurter of all the counters are black. If there are 5 white counters, how many counters are in the bag.

White:blue is 1:2. (There are twice as many blue counters)if there are 5 white counters there are 10 blue counterswhite + blue = 15in the bag there are the 15 white and blue counters PLUS the blacki.e. In the bag there are 15 + black (15 + black)/4 = black. (A quarter of the total counters were black)15 + black = 4 x black. (Rearrange the formula)15 = 4 x black - black15 = black(4 - 1)15 = black (3)15/3= black black = 55 + 10 + 5 = 20 counters in the bag (white = 5, blue = 10, black = 5)(this is a tricky question and would have multiple parts to it each giving the student more marks)

AK
Answered by Aurimas K. Maths tutor

3454 Views

See similar Maths GCSE tutors

Related Maths GCSE answers

All answers ▸

A bottle contains 300ml of medicine, the dose for a child can be given by (m*a)/150 where m is the child's age in months and a is the adult dosage of 40ml. If you need 2 doses a day, how long will the medicine last until it's empty for a 2y/o child?


Jack has 20 sweets. Will also has 20 sweets. Jack gives Will x sweets. Jack then eats 5 of his sweets. Will then eats half of his sweets. Write expressions for the number of sweets Jack and Will now have.


If Q = P / (R (4 – t)), calculate the value of Q when P = 36, R = 3 and t = –2


How do I know when to use sin, cos or tan?


We're here to help

contact us iconContact ustelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

MyTutor is part of the IXL family of brands:

© 2025 by IXL Learning