Given that x : y = 7 : 4 and x + y = 88, calculate x - y.
From x : y = 7 : 4 work out an expression for x: x = y (7/4) and substitute into x + y = 88: y(7/4 + 1) = 88y( 11/4) = 88 y = 88 (4/11) = 8 x 4 = 24substitute this into x + y = 88 to get x = 88 - 24 = 64.
x - y = 64 - 24 = 40.
TD
Related Maths GCSE answers
All answers ▸Pythagoras: If you have a right angled triangle PQR, and length PQ=5cm, length QR=8cm (which is the longest length), then calculate length PR to two decimal places.
Find the intersection point between the equations y=4x+7 and 3y=12x+21
Increase £190 by 25%
2017 Edexcel Summer 2017 Q18) 16^1/5 × 2^x = 8^3/4 Work out the exact value of x